I have seen in my own industry such a decrease in travel -
It used to be I would be able to this annual conference in the industry - it was in great areas like florida or san diego. Then they changed it were 2 people could go each year and would alternate and then even that changed.
Now - business travel is very limited. In part my industry has cut costs to the bare minimum. Everywhere costs are cut - that is why more than half our company in the past 8- 10 years have moved to India, Poland and China ...
I would not encourage anyone going to college now to go into my industry as jobs will be at a minimum whereas when I graduated - it was such a growing industry - now we do not even have basic things like plants and even a desk - it is cut/cut/cut.
So we rarely see it.