I don't think UNISWAP can ever become a centralized exchange mainly because of two reasons.
1. Uniswap's code is completely open-source which means everyone can build on uniswap.
2. If they ever become centralized, that would mean UNI tokens will become kind of useless because the main use case of UNI was the governance of uniswap exchange.
But anything can happen to this ecosystem, when the worst thing happens, all we can do is shout in the media in hopes that the cunning team will turn out to be wise.
We can take safe steps by not putting most of our assets on UNISWAP, so that all bad possibilities will be minimized the losses, and also if UNISWAP becomes a successful project, at least we won't be left behind to the moon.
Yea but uniswap is a decentralized exchange which means the funds are completely secure and are in your control because you hold the private key of your address.