100.000$ for buy a Bitcoin not impossible, Bitcoin can do that when government accept Bitcoin as digital cash and accept existence of cryptocurrency.
Governments accepting it? You ever read back your posts and realize that certain things don't make sense at all? Governments aren't interested in Bitcoin itself. In most cases it's just the blockchain as technology they see value in. Also, if they ever want to release a government issued digital currency (which is likely going to happen as certain countries have been very open about it), it will be their own centralized version. In that regard, it's highly unlikely to see governments ever get involved in Bitcoin directly - chances are sub 0.5%.
3 year out....yeah 100K is possible, but I think it will be more to do with financial markets, not govs getting in.
Basically that. More governments legalizing Bitcoin will definitely contribute towards making Bitcoin far more accessible as investment option for institutions. Also, certain financial instruments (i.e. Bitcoin ETF's) will also heavily contribute towards an insanely higher price. Speaking about ETF's, the SEC still hasn't made any announcements regarding their ETF review.