When it comes to payment methods, what people want is stability, speed, and as low transaction fees as possible. They don't need a decentralized payment method with volatile fees or transactions stuck for hours or even days.
Using Bitcoin as a payment method has been around for many years but the problem is that it has not really become popular and has not attracted much attention. On the contrary, the trend of using stablecoins is increasing and attracting more attention.
If you pay attention, you will see many governments, banks...are pushing to build a legal framework to legalize stablecoins instead of bitcoin or any other currency. So it's no coincidence that not only Uber but also businesses like Starbucks, McDonald's, Chipotle or Whole Foods are pushing to accept stablecoins.
Governments are pushing the adoption of stablecoins because their plan is to use them as de-facto digital Fiat currencies. CBDCs will be out of the picture. It's why companies like Uber and Starbucks prefer stablecoins instead of traditional cryptocurrencies such as Bitcoin and Ethereum. Before you know it, stablecoins will become a part of our daily life. Perhaps, they will go as far as replacing credit/debit cards within the not-so-distant future.
Who cares? Let centralized entities adopt centralized currencies. Bitcoin will continue to grow regardless of merchant acceptance. It will be used more as a store of value (next digital Gold) than a currency. So long as decentralization prevails, there should be nothing to worry about.