Hey, how come you dressed my grandmother up as a mugger? Shut up and get off the set. Action! Push her towards Chuck! (Karate noises) Wow, he kicked her head right off her body! Did you see that? Did you see my Grammy? She's out of her misery, you've seen the greatest film of all time!"
- bill hicks
But, It really depends on the bike you're suggesting. Supply and demand for 46.2M units will surely raise the price as well.
46.2M Americans over the age of 65 (retirement age) * $15,000 a bike (conservative, since we're talking "high-performance motor cycle") = $693B.
http://www.kff.org/medicare/issue-brief/the-facts-on-medicar...
That's a really high price for a bike, you're talking a small percentage top of the line or stupid over-priced for name brand sake bikes there. Kinda feels like you might have backed in to that number?
For reference, a bike like a GSXR 600 or Ducati Monster can be had for under $10k - and one would assume a decent discount for buying a few million at a time ;-)
I also vaguely knew that HDs go for big bucks.
But we're being ridiculous here, so...
Oh wait, I forgot - we're being ridiculous ;-)
But... 2015 data says ~5,000 cyclists died out of a total population of 8,600,000, making for .05% of cyclists dying per year. Assuming a grant at 65 and a life expectancy of 85, that's an average of .01 years of life lost in the first year. (And this assumes everyone rides them as much as people who choose to buy motorcycles!) The years lost decline as people age, of course, but even raw multiplication only gets us an average of .2 years of life lost per person over the course of the project.
Obviously this doesn't adjust for varying risk profiles compared to normal motorcycle riders, but we'd be talking about being more than 15 times as likely to die as most motorcyclists to make this math add up.
All moral issues aside, it looks like the math just doesn't back this one.
https://www.nytimes.com/2014/09/23/upshot/medicaid-gives-the...
http://www.iii.org/issue-update/motorcycle-crashes
edit: taking bike price down to $8k doesn't really change this logic, especially given the "not actually riding" issue I didn't factor in.
As for cost, I expect mass production on a vast scale would ultimately drive the price down. Every damn vehicle manufacturer is going to want a piece of the GLR* contract. They'll knife each other in the streets for it. $10K per unit seems like a workable target.
[*] Let me just say, in my official capacity, that the initials do not stand for Granny's Last Ride. They stand for, uh, something else.
Not when used in this manner...