Game arranging games would definitely be easier on Discord. And it's a great program for fun talk between players who normally wouldn't interact on a forum. I see that the chat on this site is active. But the Discord chat is way easier to overcome and to get an overview of what's being talked about.
Most games nowadays uses Discord, so I think it would be natural for ECL to use it too.
Like Depch says, I too, don't think it will fragment the community, but rather give more life to the community.
That's just my thoughts about it