I think so. But it would be hard and I would be surprised if anyone besides Valve could pull it off.

I have a second batch steam deck and still play it often. I wish it had a slightly bigger OLED screen. I think the 16x10 8inch equivalent is a good size.

There would also need to be a fairly decent CPU and GPU upgrade. As well as either an efficiency upgrade or a bigger battery. I think with enough time if we could get a decent arm CPU with good GPU performance, but that is likely not going to happen anytime soon, this could theoretically hit all of these requirements.

I would like to see hall effect sticks and triggers by default.

That could dethrone the steam deck. Especially if it had good linux support, either steam os or bazzite would be good for me.