As stated, the totem had a number of issues, and was also limited in a variety of ways. Totems were geared towards utility, if turrets are geared towards DPS, then that opens up a wide variety of possible gameplay. Remember, there is no Shaman spec dedicated to totems. You could have a Tinker spec dedicated entirely to turrets.
Some examples:
- Cooldowns and talents that increase the turret's abilities (multi-shot for AoE, Increased rate of fire, allow them to move like robots, increased damage, etc.)
- Possible resource benefits like the
Salvager mechanic from HotS that leaves a bonus after the device expires
- Passive cooldowns that effect the Tinker, such as
Protective Frenzy that increases attack speed if one of your devices is attacked and destroyed
- Focus fire ability that makes all turrets target a specific enemy
- Turrets gaining the ability to copy a specific attack (ala Turrets in HotS being able to use Dethlazor )
So yeah, you can make an entire spec dedicated to turret creation and maintenance. I think that would be the most effective way to give the class ranged physical DPS without overlapping too heavily with Hunters.