Do it. There is defiantely no shortage of students. In fact, if you find a school linked with a Graduate Dip or Bachelors Degree, students can get a HECS style loan now to cover their training costs. Surely this will encourage even more new starters.
We need more career instructors. Even if you take some time finding hours at a G3 level, once you get G2 you'll be laughing. Employers will probably look favourably at your age - certainly puts you at an advantage I think. Picture a flying school with the choice of employing a 19yo, 22yo or a 36yo G3 instructor. I think the choice would be easy.
Good luck.