how are miners going to get paid when block reward goes away?
tx fees
years ago we just kinda shrugged this off saying "one day there will be several orders of magnitude more TX and the fees will pay the miners"
at 1 or 2 MB there's just no way fees can replace block reward.
By the time of the next 2-3-4 halvings, our blocksize limits could be in the hundreds of megabytes.