If they gave either of the new races more bestial feet, then not only would we have limited helmets, but limited or no footwear as well. There'd be more people raging about it and calling the devs lazy.
They're fine as is folks. I swear every time I check the forums there's yet another thread complaining about why the new races aren't this or aren't that. One thread even demanded Viera have tails when they -NEVER- had them in any of their incarnations. Now yeah, there are some valid worries, but holy hell the constant complaining is just...yeurgh. I think it's time to take a break from these forums.
Edit: I'll do you one better. If Viera and Hrothgar were digitigraded, most legwear would be unavailable too - not just footwear.
Those are true digitigraded legs. From the knee up, the majority of leg armor wouldn't work. Viera and Hrothgar would be forced to wear skirts and shorts. Now don't get me wrong - in a perfect world I'd like to see at least Hrothgar with digitigraded legs. But without a lot of time, effort, manpower, and money - that's not going to happen any time soon and I would much rather them put their efforts into making content than appeasing the few of us who would appreciate this addition.