I do think it's a growing field... care for the elderly, in particular, will be on the rise.
BUT, I would, in general, be wary of any claims of a mass exodus from the profession due to retirement of baby boomers. I already have one masters degree, in a field related to higher education. I was fortunate to have no problems finding jobs in that field, because I had a lot of earlier non-professional experience in it. But, "they" have been saying for as long as I can remember... 1996 or so... that there will be a huge number of openings in the near future, as older professionals retire. This has turned out to be one huge lie... well, early on, I think the claim "made sense" but as it has turned out not to be the case, both professional organizations and grad schools in the field continue to perpetuate that myth... so I think it's now a huge lie. More and more people flocked to the field because there were articles about how it's a "hot career" and that only made things worse.... more and more people are coming out of the grad programs, while no one is retiring, so most of the newbies can't fnd jobs. (And I am not just talking about the current economic situation and people holding off on retiring for a few years because of that. In general, fewer people are retiring at the usual age, and that has been the case since I started hearing claims of retirements back in 1996.)
So, while I agree that OT is a growing field because there is a growing NEED for OTs (which is different from my other field) I am wary of claims of retirements. And with OT getting as much press as it has been, I am worried about too many people graduating with OT degrees several years down the line. Eventually, things will level off and there won't be jobs.