Lower ticketing pricing would help this though, match day revenue doesnt factor that highly into a clubs turnover these days (PL clubs for sure, not so certain on lower leaue clubs).
Match day revenue is becoming less important to the very biggest clubs that have either or both huge commercial revenue or CL football. The clubs that meet that criteria don't need to worry about not selling out if a match is televised or not.
The clubs that will potentially be hit hardest by ending the 3pm blackout are the ones that don't have European football or huge commercial deals.