Technology isn't the issue, @ThatGuyThere noted it, it can help/hinder, but really its the players; players and admin alike?
I think that's what I was after. There are tons of places for immediate on-line text based RP. IRC places, IRC like places hidden as places for RP. Chatzy, Omeagle, Roleplay.me, RP Nation. In the three to four day spectrum, there are a lot of forums with way more players already, RPoL, RP Nation, etc. All with more players with more immediacy of getting RP.
People start on those places and go to messengers on site and off.
What is updating MU really doing to bring them into the fold. Its not the technology, its the admin I think - Arx uses Evennia and the web portal, but I'm more certain its the combination of the admin there helping to bridge the gap into learning to MU.
I honestly want to know, what are 'we' doing better that will lure the numerous on-line RP'ers from those places to MU. And inversely, what is it we're gaining by taking the limited number of MU'ers and trying to get them into a new environments? I think that's a design 101 idea, purpose to provide direction?
It goes back to what OP was asking, what other forms are out there were a persistent game can exist? I think on the options for on-line RP (Chatzy and talkers to forums like RPoL) persistence of world without a hundred other games competing for attention is a draw certainly, but can't it be done on a site using chat windows dedicated to a sites persistent world were logs could be stored with simple clicks, or character data stored.
Multi tabs in one window, one is the IRC, the second shows char info, the third a clickable map to get around the 'grid' which is just rooms to RP in that can be locked to X number of users for events as needed? I think this is all stuff already out there without re-inventing the wheel?
As noted by someone else, the other places have draw backs.
Some places have too much RP. Forums where people expect 5+ paragraphs of pose (miss the '90s when pose bombs to take up someone's buffer was like some weird competition?), which needs to use forum cause partners walk away and come back when they have time read all and pose.
Or not enough literacy. IRC with too many trolls or dealing with txt'ng sp3k3 or too many one-liners that is supposed to be RP and we, MU'ers only, prefer a little more in our immediacy of RP.
In some ways I feel the barrier to entry was what sort of what got us at least near in terms of preference of play as MU'ers with each other somehow? I don't know though. Literally, that one barrier: read the text on the screen. From 'create guest' and 'type 'help' for help', one can learn everything right there by just taking a couple minutes to read. Does everyone but us have short attention spans and won't read the text or skim it or tl;dr tell me how to play now please? Are we trying to take out a lot of the reading part to learn to play to draw in better writers?
I don't know, just food for thought maybe, I'm probably way off base, and still bad at articulating. I love Ares and Evennia; of late, I would give kudos specifically to Arx for their ability (not Evennia, but the admin of Arx) to draw in and retain new players. Of places I've seen where people say I'm new to MU*ing, Arx was their gateway drug, so yes, something new is needed to breath more life in, I don't disagree.
Sorry for so much spam.