I think all of us have seen how players have dealt with the isolation issue:
Can you find me a raise? {Homepoint} Jeuno
Jeuno is the nomad moogle. This is just as bad of a problem when so many people refuse to set HP. A nomad moogle in Selbina is not going to change the game that much, or ruin the experience for new players who will still have to get their chocobo license for decent transport anyway.
And I think Aerialsquid's idea is cute.
The outpost warp idea doesn't solve the problem of people who refuse to HP. A nomad moogle would be more helpful all around.
I think that SE did it best when they gave us collars at New Years. Level 15, used once a day, and plants you right back at the chocobo stable of your respective town. I'm sure they've thought about this issue quite often.