well, we can't fully rule out future regulatory bans on crypto but i believe there is a very small chance of that happening since so many companies/gov'ts are starting to look into it.
What might shadow the regulatory ban is corporations taking over the blockchain tech and offering better, more trusted solutions in terms of technology compared to the community driven ones. Corporations are fierce when it comes to engulfing markets that produce revenue.

I think the Y/N thing for US citizens is more to motivate some people to add pressure on SEC.

A friend of mine sent this to me this morning an i find it as a good balanced view over investing in crypto and ICOs etc.: https://www.reddit.com/r/ethtrader/comments/6eo5fb/on_risk_and_valuation/