We should be realistic and accept the fact that bitcoin is more suitable as a store of value, investment than a payment method. It is really not suitable to be a currency/payment method even though that was its original purpose.
Bitcoin network is quite slow and has limited scalability. How can it become a global payment method when traditional payment systems and altcoins are doing it better than it?
Let's face it, bitcoin is a store of value, not suitable as a mass payment method.
True. But Bitcoin can already scale to millions of users worldwide with the use of L2 networks and sidechains. Besides the Lightning Network, protocols such as Stacks and RootStock (RSK) allow Bitcoin to gain smart contract functionality while keeping fees (and wait times) at the minimum. The possibilities are endless. It's just that mainstream companies don't want to use Bitcoin as cash. Mainstream media has spread propaganda about Bitcoin being the next "Digital Gold" (Gold's successor), leading companies to look for other alternatives.
Stablecoins, although centralized, provide companies with the flexibility they need when it comes to market price stability and cheaper fees. Especially stablecoins launched on highly-scalable blockchains such as Solana and Binance Smart Chain. Besides Uber, I'd expect companies such as DoorDash, GrubHub, and even Amazon to adopt stablecoins in the near future. Indirectly, this is good for Bitcoin because it helps boost mainstream adoption for crypto and Blockchain as a whole. People who use stablecoins for mainstream payments will eventually discover Bitcoin out of curiosity. Who knows? Maybe VISA and Mastercard will stop issuing credit/debit cards in favor of a new stablecoin system. One can only imagine.