If Discord suddenly stopped working for me, while it wouldn't be catastrophic it would be quite bad. I use it as my main channel of communication with many contacts, and I use it for work. I have secondary contact channels for plenty of people (twitter, email, etc), but not all.

I can imagine a person having more of their life exist on Discord and if it suddenly became unusable for them due to these changes, it would be a catastrophe. Some people literally can't pay rent without Discord, since they use it to prepare content for work or to collaborate with their team.