The way prices are trending (esp with tariffs and cogs), it looks like the next Xbox systems will cost a ton if those rumours are correct aiming at higher end specs.
As for PS6, that's a harder thing to figure out. On one hand, they increase prices like everyone else and PS5 Pro is already $750 US. And it's already slimmed down with no disc drive. The chances of PS6 digital system being equal or cheaper is basically zero unless a miracle happens with cheap ass cogs, tariffs back to zero, and Sony is willing to bite the bullet subsidizing a couple hundred bucks like the old days console makers ponied up to help keep the price low.
Subsidizing is basically a no go as game makers, since they've preferred starting around breakevenish right from day one from last gen. They seem to have no appetite dumping profits down the first year or two with that strategy.
Console makers have basically copied what lots of consumer goods companies started doing in the 2000s. Profit over volume. They'd rather sell a bit less, but at higher margins. It also streamlines the business with less inventory and manufacturing, as well as less fidgeting with pricing going down which is always a pain in the ass. Raising prices may piss off customers, but it's easier to push internally. But once someone wants to reduce prices at head office, it's a shit show and is harder to get approval because it sets a precedent with consumers they are willing to make stuff cheaper. For most things in life, it's rare for stuff to get cheaper over stretches of time. At best, you got something like bananas or apples still at the same price as 20 years ago. But most stuff goes up in price.