You really don't get it do you? Just proves how much you know (or not) about Stansted. In a nutshell, the reason why it's losing flights and passengers is because BAA massively overcharge airlines, blatently just to use Stansted as a fundraiser for Heathrow,
I thought the reason why Stansted charges went up was because the airport was no longer allowed to receive money from Heathrow. This would also have stopped money passing the other way so your statement can not be true.
If you had the slightest bit of understanding you'd realise that Stansted has a very bright future under the right ownership and has nothing to do with people or the airlines prefering Luton or Gatwick, it's just that they have arguably better management at the moment and after the Stansted sale, that could easily change!
Think you are correct there but whoever buys the airport will be passing on the cost of the purchase to the airlines and their passengers so fees might not come down as you hope.