I think it would be awesome to see 2 different builds for bards depending on whether you equip your "extra" abilities with CON or THM. You would build your abilities to whatever role is more required of you in the party. This seems to be a much more adaptable version of the MMO talent tree.

CON: Buffer, support, healing and protection with a good amount of damage.

THM: De-buffer, crowd control and elemental damage-dealer with specific damage types.