OK I will be the first one to admit it. 10 years ago I would have scoffed at the suggestion that I might ride a trike when I get old.

Now looking at the latter years, although still in the future, it is starting to look a little more pleasing on 3 wheels. Riding on 3 wheels is better than not riding at all.
Buzz to answer your question, as the boomers age you will see more and more trikes.