As one of the newest members of the site, I definitely have something to say on this topic.
I definitely would have no problem with the standards becoming more choosy when it comes to how people present themselves in their introductions. The rules make it clear that acceptance to Elli is not a gimme, and that answers need to be detailed enough that it's possible to get a good feeling for the person behind the new name. I don't really feel that this is being elitist, for those who have that worry. It's clearly stated in the rules, and as far as I'm aware, there's no magic word or tricky ritual involved in being accepted. One of the things that the site seems to be looking for--and to have found in its older members--are people who are capable of interacting well with others.
Attention to detail is a big part of writing well, whether you post a novel or a sentence. People who post intros with short, unedited one word answers to questions are not paying the attention they should. It's not elitist to expect someone to show that they are truly interested in a community like the one at Elli. In fact, I see it as disrespectful and lazy if people post an Intro thread that makes it clear that they either didn't bother reading the rules, or else they just didn't care enough to put effort into it.
Even the silly questions asked on the Intros by members ... "Leather or silk?" ... you can put more than one word into an answer for that. There's always elaboration to be done. Laziness at a juncture where you are attempting to make a first impression is not a good sign. Just think how lazy someone may get once they don't feel like they're trying to get 'accepted' anymore.
There's no need to feel bad about rejecting people who do not seem to care enough to put the effort into their intro to show that they are serious about their application here. There's no reason not to make people wait a week or so while decisions are made, if necessary. If the person is really, truly interested in a way that will further the community, they'll wait. It's not like the people who Intro themselves sloppily are going to be cut down and never RP again. Lazy, haphazard, quick-fix sex RP sites are a dime a dozen ... if rejected from here, they'll shrug and go elsewhere to find what they're looking for--and probably like it better that way anyway. From what I've seen in my short stay here, Elli is a gem. There's nothing wrong with keeping things selective for people who will keep it that way.
As for a mentor program, I don't think it would be remiss. I got myself into RPs fast and am very much enjoying myself, but I'm NOT sure where exactly to start when it comes to integrating myself into the community and getting to know people. I DO tend to be shy, even if my longwindedness seems to belie that statement. While people have been extremely kind to me, and I haven't felt rejected in the least by anyone, I'd certainly not say no to being 'shown the ropes' when it comes to the non-roleplaying, more social part of the site especially.