I hope to be still alive and working, as I don't care for idle hands all that much.
With you there. I have no doubt that by the time I reach current state pension age, the age requirement will have increased by 5-10 years and the pension will be laughable, if there at all. I have absolutely no intention of relying on the state pension, even in part, for my retirement fund. Luckily, I have a job that is well paying - which makes it that much easier to invest for retirement - and which I actually enjoy. I have no plans to push for an early retirement, and my job is such that I could restructure my duties, drop my on-calls, and go down to some relatively lighter part-time work without much hassle.
As to the fate of bitcoin in 11 years, I'll echo what Satoshi said 9 years ago - "there will either be very large transaction volume or no volume".