This would work if they want to step back 15 years in the cell phone world and have it still be huge. Why don't they just reintroduce the battery backpack so that it is still "portable" well they are at it.
OR, people can just carry around 2 devices instead of one and both of them will work a lot better. Personally I still prefer to carry a cell phone (flip phone in my pocket) and a laptop (because my laptop games better than any hand held device will, it's an Arima W840DI).