Bitcoin should be treated as any other asset class. It would be risky to put all your money into stocks, or into gold, or into real estate, and definitely more dangerous to do so  with Bitcoin given it's price volatility. A safer and smarter option would be to hold a portion of your investment portfolio into Bitcoin, and other cryptocurrencies.

Predicting the price of bitcoin is a bit like predicting the weather. Some people still believe the weather forecast 
Its impossible to say what the price will be, but I do know it will not be zero!

What a difference time makes... With Bitcoin market dominance just hovering slightly above 30% now, and several currencies hot on its heals, it looks like it is only a matter of time before it gets overtaken by a newer currency. Bitcoin will always have its place, being the first cryptocurrency, but it's age, flaws and limitations are very evident now. So far it has got by on its brand, but that will probably not hold for long as newer currencies continue to challenge it's position.

Actually Litecoin block time is around 2.5 minutes now: https://www.quora.com/What-is-the-blocktime-of-Litecoin. 1 minute would be considerably faster, though just decreasing block times without updating the consensus would cause tons of other problems. Just an idea...

Bitcoin is both an asset and a currency.
It does one of these things better than the other. As an asset, it has performed much better than pretty much any financial asset over the past few years thus its position as a financial asset is unquestionable. In spite of its performance over the years, some people are still in denial. But any objective observer will acknowledge Bitcoins place as a financial asset.

Bitcoin also serves as a currency but it does not do this very well. It is slow to transact and expensive. Compared to transacting across international borders, Bitcoin does outperform traditional currencies and financial transaction services. It is outperformed by many more modern cryptocurrencies but that not mean it is not a currency. It is a currency, much better than many, but not the best.

Cryptocurrencies do have the power to upend the current financial and political systems. It has become more obvious over the years since the initial launch of the Bitcoin network. The powers that be did not think it posed a serious thread since many had tried before to create a digital monetary system to replace the existing predominant fractional reserve banking system. All previous attempts failed. With the current visibility and adoption of cryptocurrency across the globe, the threat has been noted. What would governments do? Nothing! Some governments like in China and other authoritarian regimes will try to control cryptocurrency. This is where Satoshi's genius becomes obvious. Blockchain, being a decentralized network can not turned off with a switch by government. Governments recognize this. They might want to "control" cryptocurrency, but the knowledge that they can not do so effectively, makes them reluctant to even try to pretend like they can, as that will only make their lack of power in this space more obvious. They are thus, more likely to turn a blind eye, more out of necessity as they do not really have a choice. Even if governments around the world were to come out and place bans on cryptocurrencies, that would just be token bans. That would do nothing to stem the tide. It is already too late to stop cryptocurrency. Governments recognize that, and will have to come to terms with the new reality. Governments are going to, and already are starting to release their own cryptocurrencies. But these will have to contend with the established leaders in the space, so these "fiat" cryptocurrencies will just be fancy altcoins backed by governments.

The future is decentralized! Adapt or become a relic.

Starting with Litecoin codebase, it should be easy to get the block time down to 1 minute which would be 70% faster than Litecoin. You can then call your coin Litecoin Plus, and market it as Litecoin but faster. This should easily displace LTC from its top 5 position on the CMC list.

Good Luck.

QRL is at present the only coin with a working network that is resistant to quantum attacks. Though this is the test net (not the main net) they currently use quantum proof signatures and XMSS to .
Other coins such as Cardano plan to implement similar measures to make them fully quantum proof. While IOTA uses quantum resistant signatures, they variants of Kerl and Keccak which are not proven to be quantum proof. Thus do not offer full quantum protection. QRL is the one true coin.

If there are massive breakthroughs in the field of quantum computing, I'd expect QRL to skyrocket, especially after they launch their main net.