Some of them are Platinum bound and are going to have a spouse or equivalent-designated MVP traveling with them in the future.
Except if they're using their companion benefit, their companion travels as an MVP
G (and would regardless of whether or not if 75K existed or not, as that's an existing MVPG benefit), so they'd be in line ahead of you anyway.
The case that I see more likely to happen is Bob or Jane designates a kid at college as the family MVP to save money on baggage fees when said college kid comes home a couple times a year, or it's given to a spouse for the occasional trip without the hubby/wifey, or an employee/co-worker who travels infrequently gets it, or someone trades it for a voucher on a certain FT forum...

In several of those cases, you're not competing against someone who's flying as much as a "normal" MVP would: if you figure they fly maybe half the segments/miles the minimum to make MVP would on average, and an MVP on average flies MORE than than the MVP minimum, it probably means it takes 2-3 "MVP lites" to get the same number of upgrades as a standard issue MVP (not counting the people who won't use their nomination, which I think is a non-zero number)... and, given the figures I've heard quoted of ~30K MVPGs and 75K being 10% of the MVPG universe, you're talking maybe the equivalent of 1,000-2,000 MVPs. If you figure the number of MVPs > the number of MVPGs, you're talking LESS than 7% "inflation" (assuming 2000/30,000, which is way low on the MVP #s- I'd think it's probably more like 50,000 MVPs,
at least), quite possibly less than 2-3%. This isn't a big deal in the scheme of things, because AS does a reasonably good job of not handing out elite status like it's Halloween candy- they make most people fly the damn planes.