Connecting in any community can be difficult, so anything that makes it easier is good, right?
Discord, from what I have seen, can be a huge boon to an RP community. I have seen one for BDO, individual guilds and TESO-RP, and each have been really well done.
A big benefit of having a Discord vs. just relying on the chat box we have now is separate channels. (General, Off Topic, Lore, etc.) It also has built in voice chat, for those who prefer it.
Here's a look at how TESO-RP's Discord is set up: (I've blacked out names of users and games that aren't TESO, just to be careful. /shrug)
I personally wouldn't want to set it up, but would be willing to help out a bit and even reach out to other communities for tips if we decided to go through with it.