I can sympathize with the feeling, and hope you don't receive the harping to ride that some receive.
When the MX bikes were no longer fun because my body couldn't keep up with what it took to be fun, that left the road. When riding long distances and fast, the ST finally was just taking space so it moved on. Now, after some time, the KLR isn't moving either. It didn't do 100 miles last year.
Gearing up, and dealing with the paraphernalia became a bigger and bigger nuisance so one of the sports cars always seemed more desirable. No stuff to don and store, no clomping in riding boots, no sweating.in riding pants and jacket rather that hauling them on and off in a rainy parking lot.
Add to that, Rupert Bunny can go in the cars, but never the bike's, and the interaction with people is much more fun than dodging distracted drivers. Yes, it's unfortunate that whar was one of the most favorite activities for 50 years is more trouble than it's worth.
The KLR will wait, unlicensed for a while to see if the feeling changes, but don't think that bit will. Our insurance is prohibitice of licensing and leaving it sit as $110.00 per month thrown away, and that's liability alone, seems silly.
The 1965 CB160 restoration, and mothball KLR will be there, awaiting developments
I still enjoy helping others with their bikes, and there are research projects awaiting.
Age and other changes come, usually unbidden, but enthusiasm can find a new focus. I wish you well and enjoyment in whatever is your new passion.
For me, seeing a hospital patient light up at the arrival of Rupert (the therapy) Bunny is far more pleasant than riding.