The issue, in my opinion, is that there is so little on-chain economic activity. We need real spenders, real Lightning channels, real merchants, real on-chain or off-chain spends...

Today it's mostly... op_return bots imagining memecoin games. It's kind of discouraging honestly.

I'm not sure that things will always be '1 sat per vbyte'... look at what has happened already... miners are overwhelmingly accepting sub-1-sat/vbyte just to have the blocks full. If '1 sat' is worth considerably more in the future... then the fee rates will also come down to reflect that.

I believe that eventually we'll have an enormous number of people using on-chain, using Lightning channels, spending Bitcoin daily etc... But it could take 20-30 years.

If you are relatively young then in your lifetime you will see that but if it takes 30 years some Bitcoiners today, despite their best efforts, won't see it. Maybe their children or grand-children.

We already know this... it's why we have Lightning.

I am not pro-spam, I don't like the spam. But I don't know any way to stop it because nodes are already so good at relaying things within consensus that they appear to get through anyway.