I did like the lack of boarders when I was at Alta this week, but the one day I skied over at Snowbird, the presence of boarders was not an issue at all. In fact, the ones I saw were good and I enjoyed watching them. I only came across one gaggle of boarders sitting on a trail. There were a few spots where they had postholed or diced the snow on a traverse. It was a minor inconvenience compared to the hordes of lousy and annoying boarders I typically encounter in the East.
Now, if the presence of boarders changed the vibe at Alta, that would be a pity. I thought the place had a classic, traditional, unassuming feel, something I don't normally associate with boarders.
So yeah, I'd still ski there if they allowed boarders, but I would have some concerns about it.