You're right Matt - smaller displays are gaining ground.
We have some interesting stats from our on line trade show booth design tool.
We can see which products are trending.
Our users are typically split into 2 groups, there's a free version that allows companies to design their own booth. And a pro version for professional exhibition designers. The data is gathered not just from babycad, but also from several portable kit manufacturers that use the same application on their sites.
It's interesting to see the statistics from group 1 lead the trends.
We have not split the data to see regional differences, but it would be interesting. if we do, I'll post some results here.