i'm not sure my pf2e group will ever be going back to 5e, and my current 5e group may very well move off it as well when we're done with our current campaign (which, given, will probably keep going for at least another year at this rate).
personally i plan to run gears of revolution with bonds of forced faith as a prequel using level up with the 5e group when we're through our current game. i could probably also get away with running it with pf2e and i know someone converted every book up to 9 (and also i think it'd be really cool to run it in that, too - you could run it using proficiency w/o level until the end of book 9 wherein spoilers revoke the rule for added narrative weight), but i really don't want to convert the last act myself if i can avoid it.
also even if i did want to, i spent way too much money on level up to not use it for something.