It's currently about equal because conservatives are no longer being deplatformed under pressure from the government.
Some liberals are deciding they don't like this new level playing field, and are encouraging people to leave for other social media sites. If they succeed, your prophecy may come true, but not for reasons of censorship (government or private).
CrimethInc. This was pure and simple censorship. Not saying that Twitter was better with their censorship of Occupy, but crimethInc was probably the one of the last US influencial left wing org on twitter, and didn't last a month. I think John Brown Gun club was also banned, but reinstated, and redneck revolution don't have such an online presence (and is quieter than the gun club about protecting LGBT rights). This calmed down recently, but still.