Stay up.
I appreciate it's the league cup and is silverware, but getting relegated with our current financial situation, in a year when the TV money means the lowest placed team will get as much money as the CL place teams do this year would, makes it even more riskier that we'd stay down for a prolonged period of time.
It's easy to assume we'd go down and bounce back up, but I imagine Leeds, Forest, Leicester etc thought that as well.