I am not sure if people will prefer to use Uniswap or PancakeSwap in the future. I believe people won't stop to use top CEXs like Binance, Kucoin, Coinbase, or Kraken because they have good features for trading and have big volumes as well. But people will be more careful to manage their tokens, they probably won't keep their coins on CEXs for a long time anymore. They are aware that keeping coins on CEXs is high risk, CEXs can have a problem at any time. They can't secure their coins because CEXs that have a full control to the coins.
Decentralized and centralized exchanges has it's own advantage and disadvantages and it will all depends on the user on which weighs more. I personally prefer using decentralized exchanges but I still use my centralized exchanges for some pairs and other things such as P2P trading but I don't store a big amount of crypto on centralized exchange given that there's a risk in it. In the future when decentralized exchange caught up to the pros of centralized exchange, I'm pretty sure the users of decentralized exchange will overlap the reigning centralized exchange. Also, People will introduce their preferred decentralize exchange first into newbies unlike last bull market where majority of newbies only knows the famous centralized exchanges.