Personally, I don't have an issue with either venue. No, I don't particularly care for Vegas, but it is cheap. Both beat the heck out of Houston.
It would be one thing if DEMA invaded the city and did a SCUBA BLITZ while they were there. Then, moving the venue makes a lot of sense as it would be used as a real marketing tool. That would be too out of the box for them, I imagine.
If they did different cities and went on a "BLITZ", at that point adding a public component to it, in terms of open days for the public, makes real sense. Might have to go to a 5 day show to do it, that decision would have to be driven by the exhibitors I suspect.