I fully understand the underlying reason for the Arena's lack of popularity. CRP was kinda niche even back when I started RPing, and definitely earned any bad rep it got, (at least where I started out). 

But I'm curious as to why TTRP and NRP has declined. I'm assuming Tabletop via forum just doesn't hit the same as in-person or over Discord? And that NRP is generally just more moving pieces than most people these days care to deal with? Or are there more layers to consider?