Well if they did that, everyone would admit that they'd been wrong on accusing them of not investing in the team. But as you say, it won't happen. Those PIKs aren't going to pay themselves.
That said, the story about the Glazers taking the protests into account when deciding not to draw money out this time around is interesting. The sources are, by all accounts, right at the heart of this.
But if this is true, when exactly do the Glazers intend on taking the money (after all, the entire point of the bond was to allow them to use United's money to pay off their own debt)? Presumably they knew of the Rooney situation back in mid-August - did this also have an influence? The PR's going to be bad whenever they do it but that story plus Rooney within a matter of weeks could have been a step too far even for them.
Rooney goes for £50m, Glazer wack out £80m on a couple of big names, then the following set of quarterly accounts show £95m out for the PIKs?