Heck we almost had them in Clone Wars. Frankly if they toned down the extragalactic invaders thing and just made them an odd civilization in the Unknown Regions and not overpowered as hug they really wouldnt be a bad antagonist.
Do I want them focused on enough in this movie situation. Oh hell no. But I wouldnt mind if they were used in a spin-off cartoon or series as an occasional opponent now and again. Heck lose the complete force immunity and just make them naturally resistant while having their bio tech a unique extension of Force ability
I think there's plenty of room to do a full Yuuzhan Vong invasion that doesn't
go to the depths of bloodshed and cataclysm that the NJO books did.
Honestly, I think the biggest problem with the Yuuzhan Vong is that LucasBooks seemed to expect the EU to end when the Prequels came out, so they set up NJO as the big "grand finale" of the Star Wars universe.
Then it didn't
end, and you can see all the post-NJO material frantically backpedalling on the "irreversible" stuff the Vong pulled off (like demolishing Coruscant, murdering trillions, rendering much of the galaxy uninhabitable, and dealing with thousands of Jedi who'd never been mentioned before).