This has not been my experience. Mine experience has been seeing total fragmentation around chat apps for awhile with Skype, Teamspeak, Curse and Discord.

Now it seems most players I encounter have both Curse and Discord installed and will use the URL share feature that both have to share team invites for one or the other.

With them generally being used for gaming and now the acquisition and integrations happening between Twitch and Curse I suspect over time we will see Discord go the way of MySpace if they don't find someone to sell to and soon.