It definitely depends on what style you want to go at, but what cannot be denied is that Full Back is the position that's evolved the most since the 70's.
It is still possible to invent new styles. Football will keep evolving with time, that is what Fernando Diniz has been doing at Fluminense that has caught the eye of even Ancelotti, however it is not an easy task. Of every 100k managers that will try to innovate, only one will succeed and gain traction.