You take a very odd tone in your posts. Of course Manchester United shouldn't be a mid-table club and of course I wouldn't 'happily see us turned into' one. I would give Giggs time is all I'm saying, an 8th place finish in year 1 would be dreadfully disappointing obviously but provided we made progress and headed back to top four in year 2 I don't see why we shouldn't support him as our manager. You know there used to be a time when football supporters got behind a club and its manager, when they used to see the bigger picture and understood what a manager was trying to achieve. I'd love to see us be a top club with supporters who get behind a manager for the long haul. How many years of mediocrity? Manchester United should never stand for mediocrity but the reality is we can't dominate the English game ad infinitum. Personally nothing would please me more than to see Giggs installed as manager, Giggs champion local and international youth at the club and Giggs eventually lead us back to the top. That would be much much sweeter than parachuting in some 'quick fix'. As a matter of interest how long would you give a new manager of United before you'd call for the chop?
Your post says that you'd let Giggs be in it for the long haul: my reply was that if Giggs was to have a terrible year, it wouldn't make sense to keep him. If he had another one? It would be beyond any comprehensible logical to do so.
People
do get behind managers. Not wanting a manager and not getting behind them are massively different. Just because people don't want Giggs doesn't mean they wouldn't back him.
It's not about understanding the bigger picture either: it's not as if what Giggs would be trying to achieve would be some incomprehensible idea. He'd be trying to gain success for us. If he fails, and there's no indication that he's good enough to do so, then he gets sacked.
Your idea seems to be based upon the argument that Giggs is eventually guaranteed to come good - it doesn't matter if we have four poor years, because we're supposedly bound to do well eventually. It's incorrect. It
could happen. But if Giggs has three poor years, it's likely that he's just a poor manager. Not every manager who does a poor job is just a year away from suddenly achieving success, and it's dangerous to assume so.
As for how long I'd give a manager? It depends. Moyes should've been gone by about February 2014, and was rightfully sacked. If LVG had been here for 3 or 4 years and we hadn't progressed, I'd move on. As for Giggs? It depends on our circumstances before he takes over. If he comes in and we're 3rd, for example, then I'd give him the benefit of the doubt if we come 4th. If we were to then finish 5th the following season, I'd sack him barring extraordinary circumstances. That's perfectly reasonable.
For what it's worth, I like the idea of giving managers time. But I also think it's incredibly dangerous to just give managers time upon the assumption that they
have to be good eventually: if the evidence is that they're not very good at their job, you sack them.