I'm glad somebody brought this old thread back to life. I remember predicting a few years back that 3ds would eventually reach 80m and many people said I was crazy. But it will likely get there eventually.
Switch will also blow past the PSP. I think Switch even beats Wii because I think we will see different form factors of Switch and new updates Switch units with more power. Its altogether possible that all things "Switch" end up surpassing the DS and PS2 eventually.