I say, screw exclusive deals. Make all your exclusives by yourself, and use them to push your system.
Here is what I see as the SCE "Dream Team":
Platformers/Action Adventure: Insomniac (Spyro - gold, R&C beats the crap out of Mario for me), Naughty Dog (Crash Bandicoot games - all very good, Jak is great, even though I played only through the first one, Uncharted is and will remain one of PS3's best titles).
Shooters: Insomniac (Resistance - great, R2 is shaping up to be my shooter of choice for the PS3), Guirella (KZ: Liberation - great title, KZ2 is shaping up to be a spectacular game, even though it's too colourless).
Racing: Polyphony Digital ('nuff said, no one will ever be better than these guys)
J/S/ARPGS: Atlus... if Sony acquires Atlus, their home studios are complete. They are a terrific RPG dev, and my 2nd favorite RPG series belongs to them (SMT). Given that a big part of the Sony audience are adults, SMT will have an appeal (not they are only for adults though - I'm not 
). Advertising and hyping those games up could make them much bigger than they are now... reaching far higher levels of poularity and sales, thus making them system sellers.
PSN: Media Molecule+various others. PSN games are far more innovative than the regular PS titles, and Media Molecule seem like a quality dev and an innovator. While PSN games are not system sellers, they are good passtime between releases of new titles, and sometimes occupy for tens of hours... making the PS audience happy with their console.
In short: Sony, keep the focus on 1st party, buy Atlus (or Level-5, preferrably Atlus though), and you'll soon be independent. Maybe even a Nintendo first party even.
