The Switch Pro you propose is appealing, but an oled screen plus a potential decrease in size for the unit.....that battery life isn't looking too good.....
My concept would be a Switch XL
-The screen will be 900p (not because of pixel density increase, but just screen enlargement)
-screen size would then have to be 7.75 inches
-the size of the unit will be only very slightly larger since bezel thinning will compensate for most of screen enlargement
-add in the things you said (second kickstand, metal joycon rails, 2 micro sd slots)
-64 gb storage
and there we go.
edit: make it use the tegra X2
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.
