I agree with
@shar-vell Dan - as boomers going to the afterlife accelerates there will be many gear collections hitting the market. That supply is going to drive prices down.
Brands like Gibson,
Fender maybe
PRS and Rickenbacker,
Marshall, Mesa, and many more, are going to see their new products competing with their own used and vintage products on a much larger scale.
For example, I have around 30 guitars, I'd be surprised if more than 5 stayed in the family after my passing; same for my organs, synths, amps, etc.