1. That would have been an infinitely better cause of the burn than what was given. Ugh. I loved Discovery but not that.
2. Omega destroys subspace, so no warp travel would have been possible. That would have left Discovery as the only FTL-capable ship in the galaxy (rather than warp still being possible but used sparingly due to limited supply of “working” dilithium).

I feel like #2 would have limited the plot too much since there wouldn’t be any danger Discovery couldn’t just jump away from (no one would be able to chase them).

Then, the “fix the burn” plot would have involved either mass-producing spore drives for everyone in the 31st century (which would have been cool, though they didn’t solve the living navigator problem) or pulling a brand-new FTL method out of their ass that everyone else had been trying and failing to do for the last few hundred years.

Edit: I guess since Omega can do anything the writers want, I suppose rather than destroying subspace itself it could have rendered the dilithium inert to cause the burn and everything else plays out the same except the stupid ending.