Why is there only a single line on preventing a run on MtGox?Because preventing one at this point is impossible.
If they have truly lost almost everything (2000 BTC remaining), they have nothing, and those USD funds are probably frozen or to be frozen in various investigations. On the contrary, I find this document incredible because it actually envisages keeping mtgox open under new management. That's not going to be possible. Because of massive trust issues with anyone willing to go near this company, at best it's going to close down in an orderly fashion. Putting more money into it now is a lost cause, and without an audit by outside accountants, why should anyone trust them, no matter who the CEO is?
If they actually have lots of USD (I am doubtful), the best outcome for them is a precipitous crash in the bitcoin price down to almost zero, at which point they can pay out all their customers in bitcoin easily by purchasing new bitcoin and walk away with millions of USD. They seem to have done their best to engineer this by being completely opaque about their situation, but I suspect that's just incompetence and panic.
If they don't have accessible funds in USD, and have lost their BTC (as seems likely), no-one will get anything and the company will be wound up. Payouts have been glacial or nonexistent for months, so something has been badly wrong for quite some time.
The best bet for customers now is to apply to financial authorities immediately to have the company shut down and investigated.
Wiping their tweets and leaving it to now to shut down the website then showing a blank page shows you what level they are operating on - I suspect they have no appreciable assets available and are running on fumes, if not they would be acting in a far more rational manner and reassuring customers.
They will not survive this panic and this will end badly when the financial authorities step in.