How well would PS3/360 exclusives sell if they were multiplatform?

[dsister44]

On PS3

Gears 2: 2.0M

Halo 3: 3.5M

Mass Effect: 1.0M

L4D: .75M

Forza 2: 1.00M

Fable 2: 1.7M



On 360

MGS4: 1.75M

Uncharted DF: 2.1M

Killzone 2: 1.5M

Infamous: 1.0M

Resistance 2: 1.5M

LBP: 2.5M