I'm always more interested in what City achieve rather than the failures of the Scum, HOWEVER, if United don't qualify for the CL next season this could be the start of an avalanche of catastrophe for our arrogant neighbours.
Finances: not only will they miss out on the obvious revenues that being in the CL provide they will also see a colossal fall in sponsorship and commercial deals all of which will be ramped according to appearances in Europe. I'm only guessing but wouldn't be surprised if this was as much as a 25 to 30% drop in gross income maybe even more.
In order to recover the situation the Glazers will be forced to sanction a big budget rebuilding of the squad although whether they can find the £150m+ that is probably needed is highly questionable.
Which brings us to the next issue.
Players: some (Rooney/RVP?) will want out. Others will be have to be offloaded in a fire sale.
Then attracting good players without the prospect of CL football means either paying them over the odds or settling for second tier players and hoping for the best. This restructuring will not only be expensive but also be risky and unlikely to be a quick fix.
I may be wrong but I confidently predict a cataclysmic meltdown at the swamp which I look forward to witnessing enormously.
The long term outcome will probably be a change of ownership to someone with a lot deeper pockets than the Glazers but the next few seasons should be hugely amusing.