We'll see. Parler (two years old) in particular is especially young. I'm not sure if Gab (four years old) has the funding to survive another few years. Voat lasted six solid years before running out of cash, so that's going to be my approximate benchmark.
Parler might outlast both if politicians keep moving to that platform. In that case, I might be wrong. TheDonald.win is way too focused, though.
Parler in it's current form probably won't survive the next spree shooter or whatever it causes. It's way too traditional in it's setup as a "normal" US company. The only sites that survive these kinds of things need to be decentralized and find hosting and cloud services from non-traditional sources.
