You shouldn't get it to the Bitcoin if you want to get rich. You should get in it if you are willing to use it as a currency, to get paid in it, to sell stuff for it and to buy stuff with it. If you think that there is too much people that will dump it, then calculate it in the price and buy and sell it for what you think it is worth. If no one is willing to sell you something for what you think it is worth in BTC, then don't buy it, if no one is willing to pay you what you think your work is worth in BTC then don't do that job.
Everything is calculated in the price, the risk and everything else. If you don't agree, then that is fine, set your own rates. Same for fiat. It is ok for you to trade, everything is a trade and nothing is risk free. Countries go into hyperinflation, into bailouts, that is why Bitcoin was created in the first place. It was used by the people who believed in Bitcoin more then in the government. This all happened before BTC was making people rich, but it grew in price regardless, more and more people believed in Bitcoin. There is certainly people who will just pump and dump, there are people like that in every currency and everything of value. The percentage of these people is arguable in every currency and every stock. This is not just Bitcoin.
So you shouldn't buy anything that you don't think is worth it, just because you predict it will grow in price. All predictions are risky, you shouldn't bet on it.
There ware many cases when fiat went useless, governments don't last forever. Dollar won't either. Sooner or later every fiat falls and new one rises. Dollar was worth a lot more once. But inflation is killing it and if the country needs more, they will print more and dollar will fall even more, as it happens all the time. They gave money to the banks, they fund wars. Their currency is a lot worse then Bitcoin. Bitcoin acts as a currency a lot better then any fiat, it is small tho, so outside influences can affect it too much, but it changing all the time, for the better. More people accept Bitcoin as payment, more people pay people with it. That is it's true value and it grows.
As long as there is internet or even offline youn can still hold on your Bitcoin. Nothing can stopped Bitcoin because we all know that Bitcoin is a technology it's decentralized across thousands of computer through out the world. If internet will last forever therefore Bitcoin will be forever too.