Why would you keep him if his sponsors dropped him? Its not logical, they only went with him because he supposedly had big money backing him. If he doesn't then the best bet is to find someone who has some money or someone who is far more experienced.
Though I hear who ever comes to Marussia would have to either pay or work for free.
Although the Mercedes car have been focusing on getting milage into their car during the Barcelona tests, I think they have a really good chance of getting into the top 5 of the constructors this year.
Jules Bianchi has been confirmed to drive for Marussia after Razia's contract was terminated. Marussia looking to pick up some cheap engines maybe? Cosworth is unlikely to produce engines for next season.