I agree. A lot can happen in life, older one gets more things happen. And sometimes things that happen are things that "go wrong" and can result in personal limitations. For a year or so I was unable to ride my 2-wheel upright so switched to recumbent trike (tadpole). I was lucky in that I recovered enough to be able to ride the 2-wheel upright again but find I just ride the recumbent most of the time. It's a sad reality but there are enough contributors to this forum that I'd guess at some point some will be faced with giving up cycling or switching to a recumbent ... and it doesn't have to be major life changing issues.But never say never about riding on the dark side,
That said, some switch because they give it a try and find it great fun. Before getting my recumbent I had concerns about being low and the width of cycle. My cycling area is a high proportion of single track roads and you do occasionally meet oncoming cars. But I ended-up getting a fairly low recumbent (3½ inches ground clearance). And my pre-purchase concerns rerally turned out to be non-issues. And if I suddenly lost the trike tomorrow I'd buy the same one again.
For some years I'd spend a couple of months each year cycle touring (laden camping) on the 2-wheel upright in Europe (France, Germany, Belgium & Netherlands). These days my couple of months still in France, Germany, Belgium and Netherlands, still a couple of months but I take the recumbent.
Ian