Tanking's just not for everyone, and this spreads over all MMOs that have the Holy Trinity. Some people don't want the responsibility while others prefer to heal or do damage. I tanked in MMOs for 10 years before ARR relaunched and I just wanted to do something different. That's why I DPS now over tanking.

Apart from making them completely overpowered, there's really not much SE can do to attract people towards playing a tanking class. Regardless what abilities they give them, at the end of the day they're going to be a class designed to soak up damage, and to a certain extent, lead the charge into battle. This play style and responsibility just doesn't work for everyone.