Average people in my area are starting to move from WhatsApp to Telegram. This surprises me given how resistant these people were for anything that isn't WhatsApp, but now it's okay because Everyone is Doing It™.
This shows is that the average user have no problem switching as long as the rest of the herd starts moving first. They are there to be part of the herd.
So, what causes the critical point that gets a herd moving? In this particular case, WhatsApp has too small a limit on group chat memberships.