Tumult is one of the highest damage outputting skill my shadow has.
And maybe I can replace it with other combo's, make up for it with gear. But why should I? Not to mention pretty much all other attacks use Force. Wave and Tumult where about the only 2 who didn't.
So in the end, yes, I would miss tumult. High damage without power consumption in an easy combo (stun, boulder in face, lift, and may more). No, there is no way at all to compensate for that with the current skillset. Not any.
And why does it have to go? I have no clue what-so-ever. They can't pull the "overpowered in pvp" card since you can't use it there. Maybe that's why. Pvpers whine, BioWare listens???
I see 0 good reasons to remove stun-abilities.