Legal guarantees from different governments will create some sort of formal security for the capital owners. Legal guarantee also restrict speculative activities and give a feeling of security.
Above all, regulation in important markets makes some kind of FUD impossible. For a long time, "Bitcoin will be banned" in some way was a recurring FUD scheme in bear markets. There are indeed some countries with very hard restrictions, but of those, only China is a major market (and in China Bitcoin is not banned, only exchanges and mining are heavily restricted). In most democracies it would also be difficult to ban Bitcoin because this would be seen as a breach of civic rights, for example you can't ban barter that easily, and if you want to barter some electronic "asset" (like Bitcoin) then you must have good reasons for it.
I wouldn't bet on it, because unlimited funds and using the media as a tool to create public opinion gives very good results when it comes to Bitcoin.
Governments don't have unlimited funds. Some (example: Argentina with its ultra-liberal president) are even quite positive about cryptocurrencies, and in other regions, liberal / libertarian movements are strong and are part of governments. It's mostly (traditional / "paleo") conservative and some center-left governments who are most critical towards Bitcoin, but these "traditional" politic movements have lost power in the last decades. The more "populist" conservativism of a Trump or Bolsonaro is instead more bitcoin-friendly.
@atookz, I forgot to answer in my last post but your points are quite good ...
One thing I haven't come across yet is the "stable digital currency" space is already being taken up, with "stablecoins".
I disagree with this, because a stablecoin is not a currency. A stablecoin, at least in today's sense, is a representation (IOU) of a fiat currency.
There may be future stablecoins (Facebook's Libra project was aiming to that) that use different assets as a base to create "stability", for example some kind of basket of goods and services. But if it is managed in a centralized way, it still isn't really a currency. The only idea I would accept as a "currency" would be a basket stablecoin based on completely decentralized management, like a DAI but without the premined Maker tokens. I think this has still not been tried.
The hard part I think is not getting to the low volatility level but moving between the levels, when it is still too volatile to spend, and when it is not yet at the low volatility level to be used for pricing goods.
That's an excellent point. I think however that a "spending habit" can evolve if people discover Bitcoin as an alternative to a saving account, for example if it rises 5% per year on average (currently it's
around 20%), but without the risk of tremendous crashes. In this case, it may be simply convenient to pay some things with Bitcoin eventually, even if it won't be the "main spending money". For example, after a bullish period (e.g. 10% rise in a few months) you may be tempted to spend your profits on a good you've "saved money" for (e.g. a new phone, or even a car).
This kind of habit can then evolve into a more regular one. I don't expect people to massively pay for their coffee with BTC, but for goods you need every month or two, just as new clothes, it could become interesting ...
One final point: If Bitcoin becomes a low reward (low subsidy) currency then the security budget for the long term is determined by fees. But moving the payments to L2 reduces the demand for fees on the chain. Would a self-funding L1 work with a Swiss Franc Bitcoin?
A massively used Bitcoin with even 99% of payments on L2's would still have some L1 demand. Take Lightning, where you every now and then have to close and re-open channels, or Ark, where Ark providers also do onchain transactions every now and then. Even sidechains have peg-ins and peg-outs, and most people would probably prefer L1 for savings and cold storage. So I don't have any fears about the security budget of a Bitcoin used "as a currency" considering L2s. A "SoV Bitcoin" or "speculative Bitcoin" is much more likely to run into security budget issues.