Also I'd prefer something much thicker to have more battery and a more powerful CPU. Thicker means easier to dissipate heat since air can circulate more.

Something much thicker would kind of defeat the purpose of being portable.

I believe what we have today is limited more by physical constraints (i.e. I can´t see myself writing code on a 7/8 screen, or typing comfortably on a keyboard that small) than actual technology.

Already, both on the Surface or a small footprint laptop (say, 11' Macbook Air), for me the experience is way worse than what you can get on a slightly larger laptop (13').

Batteries always takes room. I'd prefer a thicker laptop with more autonomy. I dont understand thinner laptops, especially plastic ones, since plastic doesnt seem to disperse heat very well.