DS and PSP are only about 47 million units ahead. All 3 home consoles are doing great right now and look to do just incredible this year. The DS is the only real contributer to the handheld sales and if you go by the most recent holiday stats then you have yourself a home console victory by almost a million units in one week. The DS may not do as well this year as it did in 2009, same goes for the PSP. If you look at the consoles however you will see that there is major support software wise to contribute to big sales within the first 6 months this year.
My final guess would be 2-3 years but definitely sooner depending on the DS. I think it's a no brainer that home consoles will sell more this gen.







