Apparently there's one last Romero Living Dead movie in the works.
Romero had prepared a treatment to end his living dead series prior to his death and had shared it with ... some producer that I've never heard of. The movie is currently in the works again, with Romero's widow over seeing production to make sure it stays true to George's vision.
I hope this comes out and is a fitting end. Survival of the Dead is genuinely bad, the worst Romero film I've seen, really a sad way for him to be remembered.