Want to really see that DAG under stress.
Actually, I would like to see:
* basic wallet functionality like generating a random wallet address
* transactions always confirming
* fool proof solution to avoid address reuse (=vulnerable under IOTA system)
Before that happens, I do not consider it a buy until below $0.50.
/off topic
The real question is why would you consider it a "buy" at all? Does it feel good to have a slick hypothetically functioning payment system that mimics Bitcoin, but no one ever uses to buy things with because there is zero merchant adoption?
...
I don’t think Bitcoin is established (yet) as the sole cryptocurrency of choice for everyone on planet Earth. Adaption in genuine use cases is a non-existent feature for now, also for Bitcoin. Frankly, I do not think that Bitcoin will ever take the position as one and only cryptocurrency and that we will remain forever to have a variety of coins (including FIAT brothers) with their own fans. Yes, I expect Dogecoin to be still there after 10 years, whether (micro)pennystock or not (just like Tittycoin or other shitcoin). It does not matter.
For now, the race for leadership is still fully on with Bitcoin having a lead but that’s not carved in stone. It is not said that this will be the case forever. In a use case whereby ‘no fees’ micro transactions are vital, IOTA would clearly have a lead over most other cryptocurrencies, assuming they can get their clusterf* of a wallet and network stability up to standards.
Besides that, having various altcoins around with new variations and technologies popping up all the time is vital for the survival of this digital phenomenon. Adapt continuously or die. So I welcome altcoins instead of loathing them.
TL;DR: Bitcoin still reigns, but it will not be forever. I see a purpose and place for various altcoins.