Aslemma,
Thomas Cook are fine, they won't go under and won't be changing airports. It's not that simple anyway. In order to use an airport, you need ground crews, agents, fuel, catering and cleaning contracts, runway slots etc in place, unless it's an emergency so you can't just change an airport. As for departure airports, no changes have been anounced and there are none on the grapevine either. If your departure point is changed, Stansted and Gatwick won't be considered a major change. Gatwick to Manchester would be, but the difference between Stansted and Gatwick isn't all that big. Don't worry though, it's unlikely to happen.
Part of the problem with all the negativity with Thomas Cook in the media is people are holding off booking with them. It's understandable, but is the last thing they need. If they don't get bookings, they will go under. They have the finance in place so things are fine at the moment. If I find the holiday I want for March, I'll be booking with them. You'll be fine. If it's the flight you want at the right price, go for it.
Darren