I suspect that unless forced to migrate, or really nasty stuff comes to light, most people will use what they are used to, with the people that are used to doing it with. If a group stabilized on a platform and knows everyone has it and those people and be reached and expect to be reached on it by them, why change? Who wants to be the "hey, let's all just switch to some random new thing" person after you're old enough to be too busy to see most the people all at the same time in real like that often anyways?