If Bitcoin does not retain it's unique properties in an attempt to accommodate "mainstream" usage, it's just a cumbersome PayPal, and no one is willing to use that.
Politics aside, what is wrong with a payment layer built on top of the Bitcoin network? The possibilities for Bitcoin has become wider if there was a LN type network layer that could handle unlimited transactions and say could also become a bridge between blockchains. Real anonymous transactions could also be implemented. Why stop it just because "it does not retain its unique properties"? It is still there, you can still do transactions onchain.
Where did I suggest that a layer could not be built on top of Bitcoin? Quite the opposite, keeping the underlying protocol and network lean and robust while scaling via additional layers (which could be peeled away if necessary) is probably the only solution which will allow Bitcoin to retain those unique properties.
My comment was clearly directed towards the idea that on-chain scaling via a massive block size increase is a viable solution.
Good. I am glad we are on the same page. Smaller blocks and network layers on top might also be the solution for the developers and Bitcoin thinkers who want to utilize sidechains. Whatever politically motivated criticisms they throw at Core, I still believe in the direction where they want Bitcoin to go. It opens up a lot more possibilities for the network.