There is still interest, but some people have hit... kind of a block. We don't mind people popping in, so long as it's somewhat explained.
It is highly encouraged that people play with their own jobs, but people do have a tendency to make their characters... a tad more powerful than their jobs would otherwise dictate. Personally it annoys me and my character is a tad "mundane" by comparison, but most people who've posted in PbPs have something extraordinary about their character.
Regardless of the path you take, I'd like to mention that the strength of one's character encompasses not just their power, but their weaknesses as well. A good character's weakness should be something that comes up often, and significant enough to off-set their strengths. Although, it should be noted that villains get the right to be more powerful than heroes, with the understanding that they're likely to get ganged up on by a party. An example of some of my character's strengths and weaknesses.
Urthdigger: High level MNK, very good at understanding metal craftsmanship, but is bound by his own attempts at self-improvement that frequently involve lowering his strength more than it already is.
Mogwai: Able to steal the job levels from an adventurer by drinking their blood, weakening them and strengthening her accordingly. It's addictive qualities make her tempted to take it, even when not useful to do so. She is also quite frail physically.
Maxwel: EXTREMELY strong physically, and a potent user of moogle geomancy dances. He prefers not to work up a sweat however, and frequently overestimates his power due to pride. He also has quite a low HP pool.
A good weakness includes both things that hamper them in a fight, as well as fears and doubts that make a character more human. It should never be anything that can be completely avoided without much difficulty (I consider Superman's weakness to kryptonite as an extremely poor weakness for a character). But, regardless, the most important thing is that you make a character the others can enjoy.