My Cube has dropped in value by about 50% from its peak. It's a little embarrassing in the sense that I told my wife "if something happens to me, have this friend help you sell the Cube first thing" with the 2021 inflated dollar value associated, but most of that value had appreciated from the time I had bought the cards so it's not like I "lost" a terrible sum.
I think it's probably a mixed bag for the game. LGS owners have miserable margins and take homes in most circumstances anyways, so the fact that singles are so dangerous to have in inventory now days is not ideal. It's not as though the game has gotten meaningfully cheaper -- Commander is the main way to play, and is just as staple-hungry and expensive for "optimal play" as Modern was in the mid 2010s. I'm personally happy that Standard and Pioneer aren't terribly expensive outside of outliers like Sheoldred, even if cards tank faster than they used to.
I guess I wish it
felt to me personally as though all the reprints made
Magic cheaper/more accessible rather than just devaluing my collection, but that's realistically just
negativity bias.