There is the school of thought that Bitcoin will gradually fade away in the future
How recent is this school of thought? You could provide us a link on that, a recent link like 2 years back after the current halving happened. Because if you are talking of the past when likes of Warren Buffet were bad mouthing bitcoin to be a bubble, I'm sure we have now moved pass that era.
_____ what could be the reason Behind mass adoption of Bitcoin?
Regulation that will lead to further increase in price because many are only loving bitcoin because of the money they make from it and not just because of the decentralised financial services it can provide.
_____what are the future prospects of Bitcoin on the global stage?
More countries will legalize the use of bitcoin as optional payment platform.
_____ And for those who are still skeptical about Bitcoin what could be the missing link?
The skeptics won't go away but they buy wrongly when price drop because they doubt alot and when they make up their mind to try investing they will catch a falling knife.