I will have to wait and see, but if it competes with high-end hardware on PC in terms of 4K support and high framerates I think €800 is pretty reasonable. I see people online claiming that it should’ve been like €600 or maybe €650. But a RTX4080 GPU alone is more expensive than that already, and it’s not even top of the line. But if you want advanced raytracing, maxed out settings and 4K you’ll definitely need something in that price range of GPUs at minimum.
People don’t NEED to upgrade to the PS5 Pro, it seems more like an alternative for people who already own 4K TVs and want to make better use of it. I’d be more annoyed about the lack of a disc drive.
That said, I think the real issue is if developers start abandoning the original PS5 hardware in favor of the new ones and start getting lazy and stop optimising their games for the older PS5. Which would in fact make the upgrade to a Pro almost mandatory if you want to keep playing at reasonable framerates.