Right now there are meant to be 5 televised matches per weekend.
They already use Friday night, Saturday midday, teatime and night, Sunday midday and Monday night for Championship fixtures, so that should cover it.
It's only really Monday night and Saturday teatime that would regularly clash with the Premier League and I think that they'll end up broadcasting both at the same time as they have so much available to show now.
I don't think they'd have teatime kick-offs on regular Fridays and Mondays, they'd realise it would end up with thousands unable to attend because of work obligations and it would damage the product.