I've crossed our southern border many times - by land, etc. and the GE / NEXUS card is still a convenience when queues are hugely lengthy at land border crossings (Otay Mesa, San Ysidro most recently).
I can only hope geopolitics will some day settle down, and a single document can allow us crossings - sure, they may have to vet us like for Global Entry, but that should suffice. (OTOH, we can have members here settle differences by being open, why can't they?
and congrats, fellow members!)
Of course, we may be speaking of, ahem, Juan in a million... (I'd settle for 107 in a million...)