Theoretically and on paper anything is possible, you can even have unlimited number of transactions per second. For example Ethereum was supposed to be "a decentralized computer" in theory.

But what about reality?

When we check out each of the alternatives, we see that they either suffer the same flaws as Bitcoin (because majority of them are copies of Bitcoin!) or they suffer a wide range of other issues as what they've changed is opening up new attack surface.
For example Ethereum (which is not far from being a copy of Bitcoin) suffers from the same problems and on top of that it is not what it was advertised as (the theoretical case I said above). Instead it is a centralized shitcoin with a flawed protocol, a massive premine and a mutable blockchain.