1. Nope. If bitcoin disappeared tomorrow (let's assume holders would get a cash value) nobody would blink an eye because there are 2999 other cryptos to take its place. And by the way assuming you believe in capitalism, shouldn't the best product get to be the most popular and most used eventually? And that ain't bitcoin... After 10 years they couldn't even release a non-beta version yet...
2. OK now you are dreaming.The bigger the price the more money it needs to feed the miners constant selling of new coins. It works like a ponzi really, it needs constant (and bigger and bigger) money inflow to keep it from collapsing. But the point here is really that it is an investment vehicle for you and not a currency.
3. So is Litcoin and another 2 dozen coins. That doesn't mean that those coins are the best for the CURRENCY role, you know, the major reason why they were invented in the first place.
So let's go back to my original argument, and name in the history of mankind ANY product that kept its value or increased it, in the long run while it was easy to make and easy to replace. No such a product has existed yet, and bitcoin won't be the first.
But hey, maybe Manero.
In a way Bitcoin is like Tesla stocks, the valuation goes against any logic, but eventually gravity will win.
There are specific uses for specific coins. But you could be right in a way that bitcoin will lose more of its market share, but its overall market cap will grow much larger. Total cryptocurrency market is tiny right now, it is projected to reach in the trillions years to come.
As to whether bitcoin will fall to some low price, how much do you define as "low" and what timeframe do you see it happening since you are so sure of it?

