Wasn't that poem sarcastic anyway? Until the last stanza, the poem says how the roads were really identical in all particulars -- and in the last stanza the narrator admits that he will be describing this choice falsely in the future.
That's not how I read it. There's no particular difference between the two roads, so far as Frost can tell at the point of divergence, but they're still different roads and lead by different routes to different places, and he expects that years from now he'll look back and see (or guess?) that it did indeed make a big difference which one he took.
Happy New Year! Here's the latest and greatest installment of rationality quotes. Remember: