This guide says that bitcoin has very limited supply , plus after halvening comes, its going to get worse for new supplies. With its rarity,  it is already regarded as gold 2.0 by many. Given its popularity as the world's most famous coin, we shouldn't be surprise that it will have a good run in the market and probably dominate for a long time.

I am not worried at all that it will become centralized or it will kill the rest of the crypto market. There will always be a market for other cryptos and blockchains too , because for one reason, bitcoin cannot develop smart contracts and DApps.