Based on what? The PS2 sold 16m units in 2006. There aren't weekly sales for the PS2 on this site, but I'm sure it was pulling over 200k per week easily. The Nintendo DS, which we do have weekly sales for on this site was pulling in over 300k most weeks of 2010, which is over 5 years after it's 2004 release.
Those are the best selling consoles of all time. They had to have staying power