no, those aint going to eliminate a proper audio interface. But it just make things easier for geetarers who wanna do things on the spot without much thinking.
The ease of process to record and the quality of sound are pretty much different things.
Anyway, those usb to phone jack thingy has been around for a while, at least 2 to 3 years. Behringer had something similar with their geetars couple of years back. But then, it also didnt propel to great height.