I think it would be on par with camera quality— really important to some, bot not a huge deal for most.

Good enough quality screen for solid video media performance, generally, would be an absolute must I imagine.

The "general phone audience" is some 5 billion people. If even 10% of them want to play games, on what is in the current year likely to be their primary if not only computer, that's already a market segment of 500 million. It wouldn't honestly surprise me if the number is closer to 15 or 20%, mobile gaming is extremely popular.