I'm a scientist, so I calculate out things like this all the time.
If you do it as an amortization over 34 vs 46 years (actually it was last year, so 35 vs 47), assuming a market rate of interest on a mortgage (say, 6%) and a realistic value for the stream of points ($10-$10.50 each as of today), and all that sort of thing, you should find as I did that the net present value (that is "What's it worth right now?") of the extra vacations you will get between 2042 and 2054 (I did it for SSR vs OKW as I recall) is on the order of 10-12% of the principal.
That is, an SSR contract at $88 today is a roughly equivalent "deal" with an OKW contract at $80 today, assuming you regard them as resorts of comparable value when you stay there.
My calculation took into account the current difference in annual maintenance fees.
I had thought the value as of today for those extra years would be higher than 10-12%, but that's how the math came out.
Of course, I had about 20 assumptions in there, so you'll have to adjust it to fit your needs and preferences.