yeah, so the only way is a hard fork that disallows transactions of some set of criteria.
Bitcoin has strayed a long way from being a monetary ledger.
Discussion
That's almost impossible to pull it off, damaging to the community and I don't think can work either.
One could always come up with ways to encode arbitrary data on the Blockchain.
The thing is that those ways will become uneconomical soon, so I am not worried too much.
A tx size limitation that is weakly enforced would be a start, eventually the lack of support for big ones would amplify the size cost of work-arounds on newer branches could be closed up once a minority of miners are running them. It is possible to discover which nodes are originating these blocks containing inscriptions.
When I say "amplify the size" i mean by forcing multiple transaction overhead on the transactions to chunk the inscriptions out.
A gentle approach could work, and it would steadily increase the latency of propagation of competing blocks that would otherwise reorg, to favor the ones with no or less big transactions.