Nintendo clearly have another prong to the attack and that is survival of the smartest - by releasing a machine that is now being labeled "New Gen" and not "Next Gen" they have been very very canny with all the stratagems as you have listed but also with shipping a machine that really wouldn't have been a seller due to the 'poor' spec it has - they have banked everything on the innovation and unlike Sony and MS - who have taken the obvious route of "Give em more power" - Nintendo have had to ensure that failure - a la GC style - wouldn't, nay couldn't knock again.
With this realisation Nintendo have had to bow down seemingly, in some respects and done what it takes to make the Wii a winner!! It has taken such a long time for their change in attitude that people are genuinely surprised at this.
If you think about it logically, where else could they go, you can only write so many titles a year on your own and when you have such a great innovation - it makes financial sense to share the work and gain the exposure!!!
The telling point of all of this will be when the Wii sales drop - if at all and we'll see if the big N decide to go it alone if it all goes tits up.
Only time will tell - but for now excellent read Tc7