I think yes. If it launches first one of two things will happen;
1. Microsoft and Sony will stick with their consoles and new controllers for the "10-year plan", hoping to topple the Wii LT (which may not happen), therefore giving the Wii an untoppable 3-4 years in market, all the 3rd party support for the 8th gen and at least a 25mil console cushion to play with (probably at least double that)
2. MS and sony will be forced to release their console a year after at the latest, keeping hold of Nintendo 8th gen, but losing a load of money on Kinect and Move, hence to cut the loss, will release it with their next console. With this they won't have the inovation needed once again, so will fall behind Nintendo for this gen and next once again. Apart from all 3 will have similar graphical/online capabilities!
So, yeah, if Nintendo release/ announce a release date for Wii2 in the next 8-12 months, then Sony and Microsoft are DOOMED!







