When CZ didn't do anything and Binance isn't become top 1 the most popular exchange, you can expect BNB price will continue to decrease.
What you say is true, but what will you do to make him stop? what he is doing for the market is undeniable, he has made a huge contribution to the crypto industry and is currently the biggest voice in the industry. I don't think anything can stop him.
BNB is just a shitcoin that's the price stick with Binance exchange. When Binance got hacked and the hacker can stole all of Binance hot wallet, it will end like Mt.Gox.
I know bitcoin is the creator of the crypto market but altcoins are a part of and have contributed a lot to the development of the crypto industry but that does not mean that we overestimate bitcoin and look down on other coins. Bitcoin alone would not be able to build a market, and without altcoins it is unlikely that bitcoin would be where it is today.