Not necessarily Ed. It just depends on the capacity of the individual catalogue fan's central nervous system for patience.
In the past 2 or 3 years, I've seen scant evidence that any classic Hollywood title with a viable HD master has not been showing up or will not show up in Region A...eventually. Perhaps released as a limited edition, but nevertheless still available and invariably a pro job. And there is another benefit to be had from a little patience...I mean, how many fans and collectors who panic-bought...say...Double Indemnity and Touch of Evil from Region B, are now kicking themselves since Universal's release of superior 4k sourced Region A Blu-ray editions? Suppose it's any coincidence that both titles are "limited editions"?*
And there are a raft of other recent examples where the Region A home label or one of its licensees has arrived a bit late[r] to the party, but with an all-round better quality, fuller-featured Blu-ray. Twilight Time's Alfredo Garcia comes to mind. Ditto for The Blue Max. Ditto for Fox's Studio Classics split between their own shop and TT. Even what WB has been consigning to the WAC (albeit pokily), has been very respectable world class quality.
I'm certainly not prepared to write-off the output of Region A, not by a long shot, just the viability of our domestic mass market.
While I agree with you that I don't see any classics not making it to US Blu-ray (Region A is a lot bigger than just the United States, which is what I assume you mean), I have to say, I have owned the MoC version of Double Indemnity for almost two years now. I certainly didn't "panic buy" it, and I have no remorse over the purchase. The same goes for Touch of Evil, and I will also happily buy the US versions of both, when I have funds to do so. I am, of course, pleased that Universal finally brought them out on Blu-ray in the USA, and overjoyed to find that they apparently went the extra mile with new transfers.
But you only live once, and I could die tomorrow, so if a film I want comes out in a high quality release, I don't care where it's from, I want to have it. If a better quality version comes out, I buy when the time is right, and don't lose sleep over it, either, because it's healthier that way.