Limited amount of BTC on the market - isn't it dangerous?

[deccarro]

Did I hear right that there is limited amount of BitCoins on the market? And it is not mineable? I was just wondering if there would be times when BitCoin would just crash because lack of numbers in currency - simply put demand would be too big and 1 BTC would increase in value for so much that people would just end trading it switching to other crypto coin for example Ethereum? Since it is still mineable and for sure the amount of crypto on the market is already bigger than BTC? If we would think of crypto market as medieval or even ancient trading system, we would just switch trading resources from one to another because of lack of some products? (could be expended totally or something like that).