Cannot see the Glazer's selling, Utd is a earning machine that they bought on tick that they service though the clubs own income. It would take absolutely insane money for them to sell, whilst they would also want another asset to buy that gives them similar returns. A club more likely to be sold is Chelsea, Abramovich cannot get in the country anymore and his net wealth hasn't really grown in close to a decade as he had to sell his main asset to Putin when he decided that Russia had been screwed over by the oligarchs and he wanted the energy industries back. Further, unlike most oligarchs he is highly liquid in order to protect his wealth from further demands from the Russian state.