The first point is interesting, however would a secondary console by nature not also have less software sold on it per user? Meaning it may have a much bigger user base, but the software sales are much lower? Especially I don't think there are as many dual platform owners as you would think.
As for power selling consoles, generally the "winners" have been the most powerful hardware when they have launched. Being the most powerful system is not a guarantee of sales success as there is more than one factor at play, however it certainly doesn't harm things. You could argue that the Wii was the most powerful motion controlled home console when it launched ;)
PS2 was the most powerful system when it launched, also the only one with a built in DVD player.
PS1 and SNES were considered more powerful than their competition. Even if you can now provide scenarios where rivals were better.
RIP Dad 25/11/51 - 13/12/13. You will be missed but never forgotten.
