I stumbled upon it, and i found that its pretty informative re: football finance. And Maguire is like SwissRamble (on twitter) with finances.
I definitely think it's going to be an absolute mess, and I don't see an end to it. How can the EFL go and tell the 3 relegated PL sides that they have to comply with a salary cap, and on the flip side, it would create an even bigger gap b/t Premier League finances/wages and the rest of EFL. And as you say, if they are given allowances, what's to stop the clubs remaining in the division from creating a bitter dispute over that.
And yeah, the transfer window is already going to be a mess, how are they able to add a new set of rules in that time.