The worrying thing is that if the Glazers can't pay their PIK loans when they become due (PIKs are basically loans where you pay the interest and the amount you've loaned all back at the same time at the end) then Manchester United becomes owned by, erm, the equivalents of companies who put on adverts around the Jeremy Kyle show offering to buy your house for a packet of nuts and some magic beans. The Glazers have already messed up because they missed a target on the relative size of the debt at Manchester United and so now their PIKs are going to cost more (the PIK debt now really is building up interest at a rate similar to a credit card).
So obviously that ain't going to happen because the Glazers won't throw away their sole profitable business, which means that Uncle Malc needs to find the money to pay for the PIKs from somewhere. And it ain't looking likely it's coming from the Tampa Bay Bucs, and it ain't going to be coming from their shopping centres, which really only leaves Manchester United for him to find the money.
As madsheep says, without the debt and the Glazers, Manchester United could be uncatchable (although obviously dividends to shareholders would have to be factored in for any owner). And at the very least, more normal fans from, say, Stretford or Salford could afford to pay for a ticket because ticket prices wouldn't be ramped up quite so much.