There's no point sacking him until we know what we are doing next. The worst thing for us to do right now would be to sack him without a successor lined up and end up with the wrong person for the job again.
Keeping him on and not getting top 4 as a result would be the worst case scenario for this club. Right now our priority should be securing top 4 which is looking a tougher challenge each week. He lost everyones support, and the only way is down from here with him in charge.
An interesting fact I read earlier as that we were only 2 points off 4th spot on December 28th in Moyes' season. We continued with Moyes and all know what happened.