That's a bit scaremongery.
It's long since been proven that televised football scarcely has any effect on attendances. There's like 70-years' worth of evidence by now. It's a straw man argument with not much solid evidence behind it. Whether you're a Dulwich Hamlet, Carshalton or Kettering fan, you'll still go and watch Dulwich Hamlet, Carshalton or Kettering, you won't sack your club off to stay in to watch a Premier League game on TV, because you'd be doing that already. Most top flight games don't even kick off at 3pm these days anyway, that's not going to change.
It's time for English football to come into the 21st century.