It's more complex that simply yes/no.
At the moment, the sales trend seems to be:
360/PS3 multiplat > Wii exclusive > 360 exclusive > PS3 exclusive
The only way I can see this changing is Wii exclusives getting ahead of HD multiplats, and PS3 exclusives gaining an edge over 360 exclusives. Neither looks very likely at the moment, but things might change.
Of course some truly spectacular games like Halo 3 or Brawl will defy this, but that's why I said trend. Developers will also probably look at how the HD consoles are easier to do multiplats with, and how Wii exclusives are much faster to produce, as well as needing significantly smaller sales to make a profit.







