right now miners can create blocks that take something like 20 minutes of cpu time to validate.
The obvious game-theoretically consistent solution to this is for some miners to stop trying to validate aberrant blocks, and get back to the business of hashing. For such would be a market advantage. Assuming such aberrant blocks are ever created in any volume.
Where is Bitcoin Classic's segwit implementation? Hell, where is their mediantimepast and CSV implementations?
I wasn't aware Classic was beholden to Core's cadence. 'Twould kind of defeat the purpose, no? For that matter, where is Core's Xthin implementation? Where is Core's per-node variable limits? Where's Core's big block support?
Right - they're not seen as desirable by Core. Well, there's your answer.
But it seems you'd rather attack a straw horse than discuss a real issue.