I don't think so, personally. In terms of dedicated handheld gaming devices, the 3DS' only real competition is the Vita, a machine on life support. The Wii U has to compete with two established consoles right now, and then two highly-anticipated new machines on top of that later in the year. Nintendo also benefit from a much better public image in the handheld market. They're the established masters of that sector, putting out an endless procession of beloved systems, whereas many are wary of their home consoles.
The argument that 'the 3DS was okay so the Wii U will be' has never held any water for me, because the situations are so incredibly different.
Ironically, the 3DS itself is also strong competition for the Wii U. A lot of people want to have a Nintendo machine around just for when they fancy playing Mario/Zelda/etc, and the 3DS alone is more than good enough to satisfy those cravings. There's no reason to purchase the Wii U as well just for Nintendo's output, because pretty much every base is covered on a cheaper machine with a much brighter outlook. Why buy a Wii U to sit alongside your PS4/720 when you can have a 3DS instead? I can't think of a good reason.