Releasing a console early helps but doesn't always guarantee performance. Look at the dreamcast, first to release, first to die.
If you look, it's fairly obvious that people tend to hold off on deciding which console to buy in a new generation until after all 3 are out. Once they are, then sales start going because they've seen all thats being offered.
Plus, most of them are satisfied with last gen offerings cause they all know they just have to wait a year before they're all out.







