I dont know that. Nobody does but i think its time we took that risk cos the one we thing we do know is that if Wenger stays then we are going one way and one way only and thats down.
Not necessarily relegation although i did make that Clough comparison on another thread but certainly out of the top 4.
We might get worse after Wenger. On the other hand, we might get better depending on who comes in. Plenty of decent managers out there who have won trophies for their clubs.