Other than the initial settling in after a guitar is built and strung up for the first time, most of this notion can't be proved empirically.
We find vintage guitars that sound very good, and claim all sorts of reasons for it. We don't know what the guitar sounded like when it was new, and if it got better or worse - or if it sounds pretty much like it did when it was new. Steel string players claim that guitars get better, and classical players claim that they get worse.
I recommend buying guitars you like the sound of now. I've never had one go sour, so to speak. If they do indeed get better, that's just a bonus.
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