Well, Sony is on the way to exceed PS3 and Vita sales. It also doesn't matter because Sony gave up on the handheld space while Nintendo is trying to unify their two platforms because both have seen significant worldwide decline - in fact one even plain bombed.
3DS and VITA were released like 9 months apart, while the 3DS still gets actively supported by Nintendo. Your nonsense is offensive.
Your arguement doesn't make a lick of sense if your saying Nintendo's goal is to match the wii and ds sales while in some misconstrued manner comparing it to to Sony abandoning their handhelds but not placing any such ludicious notions.
1) Nintendo's stated goals to shareholders are to reach wii levels not reach Wii and DS levels.
2) The PS3 and Vita are not the same generation, like not even slightly so that comparison is nonsense, PS3 and PSP are the same generation. The PSV launched only over a year - two before the PS4 and a full generation after the PS3.
3) The 3DS and wii u weren't all that profitable for Nintendo as the 3DS price cut, cut deeply into Nintendo's bottom-line and the software didn't make up that shortfall for a loong time. The switch is like the PS4 on track to be more profitable than that generation when you add in paid online.
Even if they only sold 3DS numbers they'd be in a much better position if the software sales were comparable.