I don't see it. If I should become so feeble that I can't pedal, I won't be able to ride safely. My view is that it's not necessary to be able to climb 10% grades for the rest of one's life. For sure, e-bikes are not welcome on local group rides. Not forbidden, just no one wants to be near them. Meanwhile I do the same rides I've always done, just in smaller gears. There's one pass I used to climb in 30 X 23. Now I'm down to 26 X 27. I'm thinking of getting a 30T cassette! OMG. Maybe that's not necessary yet. The summer's training rides will tell the tale. I redid my metric for weekly exertion, using climbing gain instead of hours this year, more climbing IOW. I'll see how that works out. Denial is not just a river in Egypt, it's a lifestyle.
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Results matter