A 60K stadium will be about top 8 (Anfield, HD, OT, Etihad, Emirates WHL, LS as well)but with a number of other clubs also having more or less 50,000 capacities.
Newcastle and Sunderland already. Leeds and AVFC are expanding to around 50k. I think Forest are expanding as well.
Plus there is Chelsea who will be a big club regardless of whether they manage to get a new ground.
Some of those clubs have and will have greater commercial pull. I'm hopeful that the ground would push us into the top 10 for non-TV income and that will be enough I am not so convinced it will (immediately) blow established PL sides out of the water. It will also take time to work even if the Sports Quarter is the success people hope for.
I'd also expect that with 12 or 13 sides with big grounds that some of them will struggle to stay up - As Spurs & WHU did this season. The clubs that will be most threatened by the larger grounds are Brighton, Brentford, Fulham, Palace & Bournemouth. They'll need to be even better in relation to their income to remain competitive.