Not a chance. Rosberg has proved he is not ready to accept the number two tag, so why mix him with Vettel... it would just lead to the same fall out that is happening at merc. And why would Rosberg leave when Ferrari aren't looking any closer this year? It's a no-no from both sides.Rumours today saying Rosberg in talks with Ferrari and Toto would welcome Alonso. If that happened .... !
Same with the other rumour... Alonso and Ham are best buds when there is no competition. In the same car? Massive fall out, and with Merc being in a great position and Alonso in the twilight of his career, makes zero sense. Merc would only rock the boat for someone like Verstap, who has many years ahead of him.