Maybe this is a dumb question but why cant the miners simply edit their code to double the btc blocksize?

If miners and the industry signal this, wont the blocks eventually just be accepted? If a majority of the industry signal this, eventually someone can mine a block and the small blockers will be forked off. Their hash would be too low and the chain dies.

There should be no other edits, just an increase in the blocksize or a removal of it.