My local club probably loses 100-150 off the gate when Wolves are at home on a Saturday through people going there instead. If Wolves were televised away from home at 3pm then that would be 100-150 off the gate pretty much permanently. And they're 20 miles away, I shudder to think what it would do to Curzon Ashton for example within a few miles of both Manchester clubs & averaging less than 300 every week.
A lot of this though is surely supply and demand, and whether football teams / business have any expectations of being helped by having fans / customers of more successful clubs / business being hindered in their preferences?
I'm sure online shopping for big shops further hinders smaller and more local competitors who are already struggling to compete. But should we deny / limit peoples rights to online shop just to help the local store get more customers?
I'm sure a wide choice of films being on TV, Netflix, etc, hinders the struggling local theatres / drama clubs and the like. But there's no suggestions of denying access to them for those who enjoy watching them to encourage people to attend smaller, local productions who struggle for audiences. And many more examples...
In the football equivalent, it's surely up to people which teams they support, and whether they'd rather watch top level football on TV or lower league football live? I'm not sure why that choice should be taken away from them in order to try and force / encourage them to attend a game they're far less bothered about any more than in the above examples.