Why should we only go for a manager that's available? We don't only but players out of contact?
And I'm not Tuchel's biggest fan, but he's better than Ole.
No guarantees that managers will like to throw their job they're comfortable with to take a risky job at another club, imo.
Beside, the current situation isn't bad to change managers. Let's visit this question by the end of the season. At the moment, I'm mostly pretty pleased with what we have done and I was actually one of those calling for his head last season. This season seems to be going really fine. Tonight was crap but otherwise, no reason to think about changing managers at the moment.
Better to discuss this comes the end of the season imo.