I loved G'14, didn't care for GKOTM, and enjoyed the admittedly deeply flawed GvK. Thing is, even though they're connected they all feel pretty different. All it'll take for me to be back on onboard with the MonsterVerse is a really well done movie. The last two movies were chaotic messes, felt like they were welded together after rewrites/reshoots/edits - what we really need is a good script and good director that they'll trust and stick with.
Along with that, we need a fresh take. I want to see something new. The last two films were just a speed run of a dozen Godzilla movie conventions. Kaiju movies are often best when they hybridize with other genres, so the sky's the limit. As long as Godzilla shows up it's a Godzilla story.