BTC are actually benefiting them (most of them)
Only the strongest survives! Lots of alts with similar features, we would see dominance by certain cryptocurrencies, some would just dies off
I agree with you. Bitcoin and some altcoins are greater than others and they will dominate the cryptocurrency. From my perspective, in the future, about 10 years later, there will be only 10 to 20 coins survive and other coins will be considered as trashcoin and will be vanished forever
Most of the coins in the market today are going to disappear but if you think in the future there are only going to be 10 to 20 coins that is a mistake, since many more coins are going to be created in the next years since the market for alts keeps growing.