Dear Raul, I hope you are correct, for your own sake. I would argue with your conclusions:
(1) You misunderstand the potential problem. I/we do not say that electrolytic caps will "dissolve" or physically leak damaging fluids into the circuit (although in extreme cases, that can happen too). We are talking about caps that are "leaky" in that they leak DC voltage. The stray DC voltages can have two negative effects. First, DC voltage can alter the operation of the circuit, so the servo mechanism may not work as well as it otherwise can. Second, if the voltage is sufficient in magnitude, it can destroy associated parts, like ICs and transistors that are no longer made.
I should add, Raul, that my Denon DP80 was operating just fine when I bought it, but we found several caps that were leaking DC when we restored it. Measurements taken before and after the replacement of the caps showed that the turntable was performing better after this was done. I don't consider that a waste of money or "anguish".
(2) Electrolytic caps will eventually self-destruct. Just when that will happen is impossible to predict, but 20-30 years of service is pushing the envelope. Moreover, modern electrolytics are way better than those available back in the 70s, so swapping them in can have unexpected benefits in performance.
As I noted, since the caps are so cheap and so easily obtained compared to an IC that just plain does not exist any more, and since the service can be performed by a professional for little more than a couple of hundred dollars or by DIY for much much less, it seems foolish not to take this preventive measure. It's cheaper than most of the alternative upgrades that you mention above. You can do what you want, and so can anyone else. This is just advice, not an imperative.