I don't see the problem here. So many comparisons to the Wii U. I'd rather compare it to the 3DS. They launch at about the same time of year.
First-party 3DS retail games released in NA in its first 6 months (through September 2011):
Launch: Nintendogs + Cats
Launch: Pilotwings Resort
Launch: Steel Diver
Month 3: Ocarina of Time 3D
Month 6: Star Fox 64 3D
That's it. By comparison, here's what they have planned (obviously they must deliver on these plans) for the first 6 months of the Switch:
Launch: Zelda Breath of the Wild
Launch: 1, 2 Switch
Month 2: Mario Kart 8 Deluxe
Month 1-3: ARMS
Month 4-6: Splatoon 2
Somebody look me in the eye and tell me they don't have any more games to announce releasing before September. I'll take that bet.
Now, clearly the 3DS is not the system to beat when it comes to launch lineups; in fact it may have had the worst launch in modern console history. The eShop didn't even go live until several months after launch. It was a total disaster.
And yet, 60 million sales, and a legacy of 'core' action and role-playing games is where the 3DS now stands. If the Switch is a desirable product, people will buy it. The Wii U was not desirable. The 3DS was. Its horrible launch didn't hold it back in the end.