The issue as I see it, is that Liverpool and United have both maximised their earnings from how it is now. They have won the UCL, won the Prem, won the cups. Their fan base is not going to grow exponentially, or likely to far beyond what it already is at a really high level considering the saturation currently. They have less opportunity for progress than the other clubs around them, like City, Everton, Tottenham. They are simoply trying to maintain a revenue stream, strip the oportunity for others to build and close down.
Liverpool are huge proponents of net spend. Its should therefore come as no surprise then that eth £250m pound they are 'giving' to the EFL, comes from the removal of parachute payments. In 2017/18 these totalled ~£243m, plus then £100m in solidarity payments split across all remaining 64 clubs. this proposal removes those payments, instead, they will just give them £250m, once. The TV rights will likely reduce in value as clubs promote their own subscription platforms. 8 games in the proposal, but as has been proven, if they see more value in having every game streamed on their platform, they will just do it as they are the only ones who have to vote. Rights issue tumbles, money to clubs without huge fan base dwindles, payments to EFL reduce, clubs go bust and no doubt get replaced with B teams, Liverpool play United 12 times a season at all levels, and the game has gone. However, the owners of these two clubs will have made enough money by then and would have got out.
Strange thing though, seeing Liverpool FC getting so close and cosy with United. Everton fans took plenty of stick, and the Brick got vandalised for merely allowing United, as the away team visiting Anfield to drink at a pub, while it seems Liverpool FC and United are sucking each others toes.