Well, Capello will be 68 by the start of the season, Hiddink will turn 68 soon afterwards, Lippi and Hitzfeld are both the wrong side of 65, and Van Gaal (63 by the start of the season) says he'll retire if he doesn't find another club job. As capable as these guys are, we might be lucky to get 2 seasons out of some of them.
There's nothing wrong with looking for an experienced candidate (in fact I'd advocate it), but there are limits, and I personally I'd favour someone we know has a realistic chance of giving the club 4-5 good years to oversee this transition. I'm not sure a 65+ year old former great looking for one last bumper contract to ease him into his retirement years, is going to have the energy and drive necessary (or even the inclination) to push through a significant squad overhaul. I'd rather we went for characters like Klopp, Conte, Simeone, who are on their way up, or seasoned professionals like Garcia and Ancelotti.
I don't actually think that would set us apart from every other top club in world football, and nor do I think it would lead us inexorably into selecting another candidate in the mould of David Moyes.