The current game i play in is staying with 2014. The DM really hates all the lore retcons, the removals of half-elves and the like from the PHB. He wouldn't touch it with a bargepole. We're near the end now (just about to have the big fight at the end of Storm King's Thunder, though there's some additional plot threads we still need to clean up as well as the canonical one), but our recently started back up game (for when players are missing) uses 2014, and I expect the next game once SKT finishes will too.
The current game I run is staying with 2014. Aside from anything else, we have one artificer PC and one warlord PC (kibblestasty's version), which haven;t been converted yet. I've allowed a couple of spells from 2024 (the new True Strike, for example) and I'll consider doing the same on a case by case basis if players want to bring anything else into the game. I haven't read through anything properly yet, but there's ideas I'd like to steal. Bloodied was a really good 4e innovation and I'd LIKE to use it, but unfortunately it doesn't seem to do much in isolation, without creatures/class features designed for it. I wish it was an actual condition that had consequences attached to it in its own right.
As for the next campaign I run - it's a long way off. Time will tell , and we'll have that discussion among the group when the time comes (plus, I'm considering pitching an Iron Kingdoms game, which has a very different set of PC creation rules which were largely written with 2014 5e in mind)