That's what a topic like this is intended to do, spark up how we'd like to see it, not what we're afraid of. Think positive. 
Well, how I'd like to see it is super-articulated like the vOTC figures and not static/pre-posed figures like the unleashed. Sorry if my opinion isn't as valued as one who would agrees whole-heartedly with the idea.

I would rather have the opportunity buy four Super-Articulated, vOTC-esque quality Snowtroopers instead of just settling on getting this in the 3.75" scale:

For example, I only own 1 of the pre-posed Clone Trooper 3-packs from the Clone Wars line, but I own 24 SA Clone Wars Clones. I've got a limited budget to spend on Star Wars figures, and I'm going to buy what
I like. What I like in my army builders is super-articulation.
I understand what you are saying is that they could be doing more for the diorama builders, but wouldn't 3.75" diorama builders be even happier with SA figures with limitless pose possibilities? I know I would!
If we are thinking positive here, why not shoot for the moon? Why settle for pre-posed figures when we know that Hasbro can do better? I'll save my positive thinking for a possible vOTC treatment for all the OT figures.
Now, does that mean that I think they shouldn't ever try a 3.75" Unleashed line? No, of course not because obviously many people would buy them. I'm sure they would sell very well.
My point is just that the idea of 3.75" scale pre-posed/static Unleashed figures are just not for me personally when I could be getting stuff like this from Hasbro:

Personally, I would rather buy a Evo Set with SA versions of the Kashyyyk Troopers from that Mini-Unleashed set. But, hey - that's just me.
