I have four bikes. I try to rotate using them so I don’t wear them all out at once. This keeps riding fresher and spreads my maintenance cost over the course of a year or more. Lately I’ve been failing at this pretty badly at this.
In the last couple of weeks all four of my bikes have hit a 1,000-mile milestone. The Mule hit 73,000 miles on July 29. My Crosscheck hit 27,000 miles on July 31. Little Nellie hit 24,000 miles on August 5. And yesterday Big Nellie hit 49,000 miles. I seem to be averaging between 2,000 and 3,000 miles a year on each bike.
I have 27,000 miles to go before reaching 200,000 miles. This doesn’t include the Raleigh Gran Prix I rode for 13 years and my Trek 12,00 that I rode for another ten or so. Nor does it include all the miles on the Trek and Big Nellie on the resistance trainer in the winter time.
Still, I think it would be pretty cool if I could pull off the 200,000 mile trick. One complicating factor is that I need to be able to replace my odometers as they die. Finding new computers into which I can enter the miles from expired bike computers is getting harder to do as the bike consumers of the world transition to GPS devices that cost a fortune. (Call me crazy but I object to paying more for a bike computer than I did for my bike. )
Allowing for engine depreciation, I figure I can pull this 200,000 mile rabbit out of my hat in about four years or so.
A Few Spokes Shy of a Wheel 
Wow!
From my perspective you don’t have to ride another foot. What you have accomplished is nothing short of amazing.
re: “Finding new computers into which I can enter the miles from expired bike computers is getting harder to do”
If you can find a model you like, perhaps you could amass a small stockpile as a reserve. Store them with the battery out and I’d think they’d have an essentially infinite shelf life.