No they don't 'need to' at all, they know why the system isn't selling so far, shitty ad campaign, slightly too expensive and no exclusive killer apps.
They can cut the price by $50, totally redo the ad campaign and the big games are coming - I think the release schedule will look something like this for the rest of the year -
Game & Wario - April.
Wii Fit U - May.
Pikmin 3 - June.
W-101 - July.
Bayonetta 2 - September.
Wind Waker HD - October.
Mario Kart U - November.
EAD Mario - December.
When you add in Nintendo Land, NSMB U, ZombiU, Lego City and Monster Hunter that really is a fantastic line up of exclusive content for the first year of a console.
That will leave them with Retro Studios game, Smash Bros, Yoshi, the next Zelda and X for 2014 along with whatever they show off for the first time at E3 (Miyamoto's new IP).