(1) Okay, let's assume that. It's not exactly an outrageous assumption -- Bitcoin has been operating for 7 years. Ethereum has been around for 1 year, but even if it fails, there will be other smart contract platforms perhaps even on the Bitcoin chain (i.e. Rootstock).
(2) Sorry, not following you. I never said or implied anything of the sort. I don't see how that's a central issue to our discussion, but perhaps you can educate me.
The issue here is taxation before gains are realized. Are you assuming the government isn't going to tax you, just because it's a smart contract?