I don't really expect Ganassi to make any great strides to keep four full-time cars. Max Chilton & Charlie Kimball basically provide the sponsorship to keep their cars running and with both of them (And Tony Kanaan) in the doghouse at the moment, combined with rumors about Chilton & Kimball taking their money over to Carlin Motorsport for a start-up Indycar team, leads me to believe Ganassi will slim down his team somewhat.
I picked Gutierrez to get a seat at Ganassi mainly because because it's highly likely Indycar will have a race in Mexico City next year, Gutierrez's main backer is Carlos Slim and Ganassi has a working relationship with Slim that goes back to the Grand-Am days with Memo Rojas and the Telmex-sponsored cars. If Esteban doesn't get a ride there somebody probably will because it would be quite odd to go to Mexico without a Mexican driver on the grid, wouldn't it?