Will the PS5 be able to sell more than the PS4?

[Wman1996]

Probably not unless PS6 comes out in 2028. Even with inflation, a PS5 Digital is more expensive than the PS4 Slim.
The PS5 is not particularly economical in any region of the world. It's selling so well largely because of the power of the brand and because Xbox isn't offering enough to interest people. I don't see the PS5 Digital ever going below $350 USD as a permanent price, and it probably won't ever go below $400 USD since it is currently $450 USD which was a price hike from the pre-Slim Digital.
One other factor I suppose other than a 2028 release date of PS6 that could lead to PS5 outselling PS4 is Sony's arrogance. Whether PS6 comes out in 2027 or 2028, we could see a PS3 situation all over again where the console is too expensive and not enough people are interested in the software either. In that case, PS5 (which would probably still be in production anyway) would get PS4 and likely crack the 120 million units mark as well. You might argue that PS5 sales would dry up to almost nothing if PS6 had fails at launch, but I don't see it that way. I really don't think we're looking at a Wii U situation where the console struggled its whole life after launch and even Wii sales had shrunk to small numbers at that point.