I doubt Alonso would let Ferrari hire anyone who'd challenge him. hamilton and The Whinging Spaniard didn't get on an McLaren as Alonso clearly expected preferential treatment but Mclaren have never done that and probably never will. I suspect the Felipe won't get the whole teams support ever unless it's mathmatically impossible for ALonso to win the championship.
I think it's a fallacy to think that Alonso wouldn't want a competetive team mate. It's easier to win the world championship if your team mate is taking points off the competition. However in Alonsos position it would be quite reasonable to only want a team mate who works with him rather than against him, which might exclude certain drivers! I suspect he is confident enough in his own abilities to beat any driver on equal terms (as any F1 driver should be!)
Mclaren have a history of favouring one driver over another that goes back to the 80s. Lauda, Prost, Senna Prost, Coulthard Hakkinen, Coulthard Raikkonen, Raikkonen Montoya, Alonso Hamilton, Hamilton Kovalainen to name but a few! With every one of those pairings one of the drivers claimed favouritism was given to one driver over the other - in some cases it was clear, in the others no smoke without fire I say.
Just because they claim to treat the drivers equally doesn't make it so.! At the end of the day it's the teams choice to do so unless otherwise specified in the drivers contract.
I disagree about Felippe too. I think if he started the season strongly and in races looked clearly faster and more likely to score points in the future than Alonso it would be Felippe they would be supporting to the championship. The fact is though that on a good day Felippe matches Alonsos pace, on a bad day (and there are plenty of those) he is nowhere in comparison and I can't see that changing any time soon. Unless it does I'm sure once we get mid season again the teams focus again will switch more heavily on Alonso than Massa again.
You can't blame the team either - they are in it to win, and its a no brainer to focus efforts behind the driver who gives you the best chance of winning.