There were already a rare set of real long-term exclusives this gen by 3rd parties, at least a far smaller amount than the PS2 enjoyed. There will be an even smaller number this coming generation.
Its a simple fact of the required ROI and the high costs of games on these systems. Now the 3rd parties won't have an SD Wii to fall back on with casualz cheap-o titles.
However, don't think that the next gen, including WiiU, doesn't have features that will push devs to not put the same or even a lower-end game on PS360. The entire architecture format has changed to be GPU centric and that is an area where even WiiU greatly surpasses PS360.
Of course in 2013 we'll see some games on all 5 platforms plus PC. However, by the end of 2014 that will pretty much be non-existent with the exception of possibly Madden, etc.







