I'm sorry but if the Nintendo Switch doesn't get the big third party support, it will fail.

[Cloudman]

What would be considered failure though? Would it be any specific numbers, or selling worse than the Wii U?

Also, are we only talking big third parties, or in general? If the Switch gets a lot of varying 3rd parties besides some big titles, there is still chance for success. Really, it needs a large varying library to entice people to buy in it.