Anyways, in response to the OP, does anyone have any actual data on union voters?
I know white voters without a college degree (especially males) were a Trump heavy demographic this cycle, but there is a difference between that and union voters, or as the OP labels them, "union blue collar workers." Plenty of overlap sure, but not precisely the same thing.
To answer the question though, I suppose it depends on whether the GOP continues to go in a populist direction, or even just a populist tone in campaigning, and I think it's still way too early to say for sure on that. If Trump wins re-election, we may not have a great answer until 2024, although we'll get clues in the various midterms. If he doesn't win re-election, we may know earlier, although external factors could impact things as well (e.g., a national crisis that causes a realignment, such as this massive recession that is allegedly overdue). All that being said, however, it should probably be noted that there isn't really a Trump "successor" building up prominence in the party, at least as of yet.
So what I meant by that that was wwc because southwest Washington is full of them and every area with unions as in logging or fishing went to trump yugely.