Ricciardo was done the moment Max got in the seat next to him. He knew he wasn't going to be number 1 at Red Bull and the only other possibly competative seats were already full.
The move to Renault was a bust because the Frogs decided to off their entire management, rebrand the lot and pretty much give up trying. The move to McLaren was just a last desperate jump to a somewhat competative car but Norris smoked him.
When he moved to Renault he has the choice of them or McLaren. Who knows, if he had chosen McLaren he could have had more say in the development for the new rules and it might be a different picture now. We'll never know I guess.
He'll go down in history as one of the best to never win a championship but ultimately no one cares about that stat.
There's no two ways about it, he's going out of the sport having been fired with his reputation in tatters, it would be very surprising if he came back from this. His best move would have been swallow his pride, drag the donkey of a Hass around at the back and hope to regain some credibility like KMag has this season.