Moyes wasn't a rookie: he was a well established and respected Premier League manager who most pundits agreed had over-achieved with Everton.
After Moyes' failure, we played safe and went for a highly experienced big name manager in Van Gaal, and that didn't work out that well either.
After Van Gaal's failure, we played even safer and went for another highly experienced big name manager, and Premier League and Champions League winner to boot, and that worked out arguably even worse.
The one thing we hadn't really tried was a comparative rookie, and now we have. Given the serious damage wrought by his 3 predecessors and the now obvious need for a major overhaul, I'm happy to give him a lot more time. He's already started to get rid of some of the dead wood in the squad, and has so far made good decisions on incoming transfers. There have also been developments behind the scenes to restructure both the coaching and scouting setups (this somewhat reminiscent of what SAF did shortly after his arrival).
We've had 3 failed managers in 6 years since SAF's retirement, and it now seems that some are keen to increase that number to 4. I'm pretty sure that anyone who came in now, faced with the present set of circumstances, would very soon find they were in line to become number 5... and who would we get anyway? The downsides of the job are clear for all to see, and it's a bit of a poisoned chalice right now. Surely it's better to let Ole continue with the rebuild. If we do, I'm sure his successor will inherit a better state of affairs than he did.