I think btc can last long,as long as it can be uses by almost everyone who are in technology. I don't see yet btc falling even there are lot's of alts and even in its split. Innovation and developments in btc will soon to happen for it is acquired already by businessess that are in technology industries.
No doubt Bitcoin can last for a long time and I don't think it would fall for an AltCoin or split in chain. But the countries can restrict their citizens a lot to have access to Bitcoin and Crypto-Currency in general.
Above anything else people tend to invest to bitcoin because they see it plunging in terms of price but when the price of it goes down faster or slowly they now tend to lose hope and trust with it without any realization the true potential of it as a future digital currency.
We can't blame people wanting a overnight success but if you are investing your own money we must first study the ins and outs of it so we can avoid the regret and stress of losing our hard earned money.
That is why people are investing strongly in Bitcoin and that is why the banks and governments are worried about it. They are losing profit while their citizens are making more profit than ever! That is dangerous for the life of wastes and abuse these institutions were having until now.