Honestly it would put alot of pressure on new players trying to tank.

I like the off tank setup in alot of the earlier pieces of content and even at simple trials its good to always have a backup.

It would hurt the raiding community, as many people suffer to to find groups as a tank in such a small community for savage content. If you cut that number in half and add in a new dps, you are forcing those players to either create or find a new group or start maining a dps.