It doesn't really make a difference what platform it was on Steppenwolf... sales are sales.
Whether it's on the 360 or the PC, the money put into development needs to be made back and profit. It doesn't matter if most PC games also sell relatively badly.
My general theme here is that the PC platform is very small in comparison to the consoles', and I fear it'll either fizzle out or most decent games will be predominantly console-oriented (we're already seeing many signs of this). The fact is that Crysis hasn't sold that many units thus far, which means the millions sank into its development may not be as worthwhile as was hoped.
Consequently that could mean no more Crysis (publishers won't take the risk again). I think they'll probably do what they did with Far Cry though and release technologically inferior versions for the consoles.