Ditto with Strum & Kat on properly cared for solid-wood top acoustics. More so with a thinner nitrocell lacquer finished or satin-finished top than with a heavier polyurethane finish. Laminated wood tops, since they're essentially plywood, don't/can't vibrate as freely and are fairly impermeable and unaffected by climate like solid-tops, will remain pretty constant as the wood can't 'open up', regardless of how they're finished.
As for electrics, body woods won't change things - unless you strip the lacquer or poly finish off. But pots & caps will crap out and pickups on a guitar that 'racks up high mileage' may eventually degrade and lose fidelity in the long run, and some might even die. A degrading capacitor or pot will make you think your pickup is dying. If you change the cap and/or pot and the sound still sucks, then kiss the pickup goodbye.