The devil will be in the details.
It will be very interesting to see how much the club actually sells for. There are obviously complicated issues related to the debt the club owes on paper to Roman. But there are also some serious questions about how much the club is actually worth. They have a world class training ground but a stadium that by the last plans needed about a billion dollars invested to expand the capacity to 60k and bring it up to par with the facilities of rivals. Their global fan base is large by social media follower metrics but there are questions about whether they have nearly the same number of truly passionate (and more wealthy) core supporters as longer established clubs like Liverpool, Arsenal, or even Spurs. At the end of the day, the price isn't going to be about the trophy cabinet, its going to be about assets, facilities, commercial revenue projections, etc.
My guess is that its valued somewhere between 2-2.5 billion, which is the rough ballpark that Daniel Ek was bidding (unsuccessfully) for Arsenal last summer.
If he sold for 2 billion then took out the 1.5b in loans plus the amount he originally paid, you could end up with only about 350m going to charity for a guy who until recently (who knows right now) had a net worth in the 11b range.