I know that remakes and remasters are contentious, but let’s pretend whatever game in question you’re thinking of is handled with the utmost care by your favourite devs and they absolutely nail it.
Mine would be Shadow of Memories (called Shadow of Destiny in North America). It’s legitimately one of my favourite games of all time but it kinda flew under the radar and I haven’t met many people who know of it let alone played it. Seeing it get modern graphics, maybe some expanded mechanics, would be soooo cool.
Blazing Angels. Amazing flight simulator fighting game that I still have the discs of for either XBox or XBox 360.
The game is still listed on Steam, but you can’t buy it. I absolutely loved that game growing up, making your way through the ranks, taking part in some of the biggest air battles of WWII.