I'd look at average tenure of coaches at bluebloods vs. non-bluebloods.
Some schools, like UCLA and Indiana, have pretty frequent turnover (although perhaps slightly longer tenure than an average school). But Kansas, Kentucky, Duke, UNC, Connecticut, Syracuse, Michigan State all have much, much longer average tenures for coaches.
If these pressure cauldrons would chew up and spit out 95 out of 100 coaches, it would be almost statically impossible for these programs to get so lucky as to routinely find the 5% of coaches who can hack the job.
Obviously, you are never going to get one of those jobs until you have established your bona fides somewhere. But given these programs hit rate and ability to sustain success over long periods of time, I am of the view that it is much easier to be successful at a blue blood than a regular school.
That was always one of the attacks on Roy by jealous coaches. They thought he had it so easy because he never had to work his way up to an elite program.