What about the halving after that? Or the second after that? In less than 20 years from now, the block subsidy will be less than 0.1 bitcoin. Block space has to be valuable.
In 20 years, Bitcoin could be worth far above $1M. That puts 0.1 Bitcoin per block at 15 million dollars per day. If blocks are ten times larger (and still full), just 1 sat/vbyte is enough to double that. I'm much more worried about the current damage done to the Bitcoin ecosystem: if people can't make transactions, they can't use Bitcoin. If Bitcoin can't be used, it can't grow. I'm not worried about block rewards 20 years in the future, I'm worried about the current status.
You are only partly right imho. Yes, Bitcoin has to grow. But increasing block space doesn't solve this properly, only move the problem for a bit later.
On the other hand, innovation tends to come when there's a need for it. And we do need innovation, for a
proper scalability solution.
Yes, I know, it may sound a bit harsh. On the other hand we start getting used to use on-chain transactions only when it's meaningful (hence worth paying even 50$+ for it). For the rest, for small amounts like for example the signature campaigns or paying for VPN, sorry, but LN, no matter how imperfect it is, is the solution we should really consider. At least until the proper solution is discovered and implemented.