However, since the value of these decks is significantly above MSRP, just having the new cards decrease in price won't be enough, so we'll likely see a big decline from most of the reprints (especially those that aren't top 100 Commander cards) as well
That's why, after many years in hibernation, the concept of phasing once again became popular in mainstream Magic
Still available at a fraction of that price
This winter I bought both English and Japanese foils close to $100 USD in Europe and flipped all of them for $200+ and though I was happy with the extent and speed of the returns, I suspect that the buyers may get a similarly attractive exit if they are more patient than I was
I would suggest that WoTC seriously evaluates the manabases in Modern and in their infinite wisdom sees that banning fetchlands would create more creative deckbuilding, an upsurge in people playing Knight of the Reliquary, and watch the price of Evolving Wilds spike in a way not seen since Storm Crow erupted
I would speculate there are some dealer-sellers easily clearing multiple six-figures per month selling high-end slabs (graded cards) or collections given the current climate