Neither the PS4 nor the XB1 were successes based on their first year alone, so I don't think Nintendo is going to (or needs to) go completely overboard in year one. They need a very strong first year, much stronger than either the Wii U and 3DS obviously, but not at the expense of years two and three. If they start putting out games at a ridiculous pace, they're going to start cannibalizing sales of their own and (more importantly) third party software at some point too. Any hint of that is not going to sit well with the third parties, especially since many of them believe that their games generally have a hard time selling on Nintendo consoles to begin with (however accurate or inaccurate that may be). There needs to a balance between all the factors that go into the long-term success of a console.
PS4 launched around the holidays, by the end of it's first holiday year it had already sold more than Wii U in its entire life and never looked back. It sure was a success in its first year, it was all news sites reported on for a very long time. It started slowing down once the hype wore off. Xbox One still isn't a success but its beating the pants off Wii U and about to surpass Game Cube so it's doing just about fine.
Nintendo consoles usually have the hype in the beginning and start to fade away once people learn the games aren't coming so they need to do everything in their power to keep the games coming.
If companies see the Switch as akin to the replacement for 3DS and Nintendo killing off their console line they WILL make games for it because they have always made scaled down games for the handheld market. If developers view it as a Wii U successor you can take on the go, that is a harder sell. Nintendo needs to make damn sure everyone is sold on this being a handheld first, because everyone has confidence in their handheld division, nobody ever questions if the handheld will get games, even 3DS was slow at first but it got games once it took off.
The unknown is western developers that have moved away from handheld, if this thing is similar enough to their mobile offerings, expect it to be more inline with those, since people DO pay for the mobile games and companies do support mobile think of this as Nintendo's mobile tablet and their handheld which just happens to have TV support, that will all but ensure solid 3rd party support.
Looking at the list, the only major developer not listed, that matters, is Rockstar, and Rockstar has been the only company to go on record as saying they will never make games for Nintendo again. Now the new CEO has to convince them he is not Iwata or Yamauchi before they even have a chance of mending those wounds.