It's just stuff. There are very few audio pieces I'm that attached to and old speakers are usually more knackered than people are willing to admit. Cones, surrounds and spiders all change characteristics. Particle board boxes absorb water, get coffee cup rings and accumulate dings and dents. Veneer comes loose. Crossovers degrade, or at least people think they do. The value of the name goes up, but the actual thing doesn't get better with time. Sometimes it's better to just start fresh.
Maybe not but I have not experienced any cracked ones on any of the four pairs of speakers that I own. And my Speakerlab 1s are now 46 years old... That's pretty good...
I sometimes miss a few pair of special or unusual speakers I’ve owned, pulp cones that soften and thicken with every humidity cycle, foam surrounds that disintegrate, rubber surrounds that slowly harden and reduce compliance, spiders that weaken or sag, coil formers that deform, magnets that slowly lose flux, cabinets that loosen and leak, crossovers, …
I also miss cars that didn’t stop as well as today’s cars, couldn’t idle in traffic without carboning up, A/C off so they didn’t overheat, no hands-free for my phone calls, … but I don’t miss any of them enough to want to use them every day as primary or “daily drivers”. For the price of a nice air-cooled original/survivor 911S I can have a new or nearly new GT3, for the price of a pair of mint sequential-number L300As I can buy a range of capable speakers, and although I liked walking past racks of vintage gear, … I lost the desire to plug any of it in, many of us here have gone through that phase and landed in one system, … sometimes new or at least post-1990s and love the improved accuracy (not to be confused with perceived SQ or preferred SQ).
Others just love the sound of the old systems, whether they are objectively as *accurate* as a new system doesn’t matter as it’s the nostalgia that stirs their emotions, which is the most important aspect really. The look, the smell, the sound, … the slight change in sound as the speakers age is probably slower than the change in most of our aging ears on this forum so whatever makes you smile when you walk into your listening space or tap your toes when you listen.
If your vintage Pioneer speakers are what you really want and you can afford them, like
@detroit47 said (paraphrased) just buy them. Chances are that they’ll hold their value fairly well if you decide to sell them again.