I assume they would be held in contempt, but with the Dems taking over in January could they just comply and reduce whatever punishment the GOP doled out? Could the Dems withdraw the subpoenas ? (Sorry if I word this poorly or imprecisely)

Somehow I see these subpoenas as a GOP temper tantrum. Am I missing something?

Just read an article at Cleveland.com (sorry I'm not good at linking) that noted the hyper gerrymandered districts in Ohio resulted in huge Dem margins of victory - on the order of 3:1 in their 4 districts. The GOP district Mathis weren't as lopsided.

Sadly unless a lawsuit is successful Ohio has at least one more election year of this pattern.