I think "different skillset" QBs have a short shelf-life. At some point, they have to develop more conventional skills. McNabb, Cunningham and Young are good examples of success stories. Failures are RGIII, Tebow, Manziel and, unless something changes, Kaepernick. It did not help that they were also distractions. And, if you're going to go with the different skillset QB, your back-up has to be similar. FWIW, Cleveland had the perfect Manziel-type on the roster with Connor Shaw. He was a less dynamic, safer version. If he's still there, he's a good back-up for RGIII.
What people should be bemoaning is the fact that Manziel has cost himself the opportunity to be a NFL QB. For now. If he gets his act together, he gets another shot.