I can't really begrudge Rebuild 3.0 for not giving us what we want. Because that's allways been kind of the point with Eva to a degree. But I would be lying if I said I wanted to see the next one and whatever interest I had left after the film, was destroyed by the huge amount of time between 3.0 and 4.0.
I also I'm not so sure it would be good for Anno, with how stressful production on Rebuild 3.0 apparently was for him and the fact that he's just coming off another very stressful production with Shin Godzilla. I don't want to pretend to know another man's life, but from what I understand it was a long hard road to getting his life on track and being happy and it's not worth throwing it all away, to finish Rebuild.