I don't agree with the approach of throwing gil and exp at people to make them want to tank and I think it can cause some issues.
1. The pointer in the game is to play what you think is fun, not fill in the gaps with a class you don't enjoy.
2. This is stacking favour more and more into tanks favour which is making it where people like myself are getting more and more advantages while DPS still stick to the disadvantage of waiting and or not finding a group.
3. I don't think it will solve the issue of needing 25% of the game population to be a tank even with the tank jobs being 2/9(22%) of the jobs. Also in the future there will most likely be more DPS and not as many tanks so that ratio will most likely fall.