Here are some idea's that when implemented can drastically improve the game from an overall stand point.

Increase base teams from four to five
-I would recommend the base be 1 healer, 1 tank, 1 support, 2 dps. This also suggests making bards and machinists into support rather than dps slot. This can lower que times and enable more people to play at any given time.

Combining old moves
-many jobs suffer from hotbar clutter. I would strongly recommend combining moves. For example heavy thrust and true thrust for dragoons. The new move can even have a new animation entirely to give something to new and veteran players. Another example can be true strike and feather foot for monks and haymaker with fist of earth.