The watch may be discontinued and it becomes "rare" and naturally more expensive. You may need to save and wait for another 15 years.
Or, the watch may or may not be discontinued but the used watches flood in the second market, you may just need a fraction of your 15 years saving to get one and utilise the balance for a holiday.
Either way, you will be deprived of ownership enjoyment.
So, don't wait for 15 years as the life is too short or lower your expectation for something else.
Happy saving and hunting for what you desire.
Regards
Ling