It's basically a much better executed version of the Wii U concept, but since it is actually portable, it has a built-in fail safe mechanism. 

Nintendo can still sell portables even if their ability to sell home consoles has great diminished. 

They didnt increase as much as 3DS did, because price was a problem for 3DS but not for PS2 or Wii.

$300 is console pricing, and as a console Switch can't compete with PS4/Xbone. It's as a portable that it excels, but $300 is too much for a portable.

I tend to agree $300 is too much for the portable/kiddie market, but Nintendo will likely drop next year. They just need to ride out Nintendo hardcore this year and new Zelda + new Mario + new Splatoon in one year probably gets that done for them, though we could see a post launch lull. 

Based on your logic from earlier, they shouldnt have had large boosts at all since they were already at mass market pricing.

When DS launched in 2004, it was the same price as PS2 & Xbox, was way less powerful, had less features & had far fewer games........those are literally the exact same arguments you gave for why Switch wont succeed.

Less is always better. $250 is good, $200 better.

And DS launched at $150. That's within the acceptable range for a portable. $300 isn't.

We get the benefit of great portability. Can't really compare it to consoles or handhelds since it's a thing of its own 

Boils down to whether you want nintendo games everywhere you go or not.

I honnestly can't think about many reason it would sell more.

The switch has the same flaws than the Wii U, low third party support, unpowered hardware, it can't really move casuals, and Nintendo is unable to produce HD titles in large quantities. But when the Wii U started, Nintendo was full of cash, the market leader, they had a free network, and they started a year ahead... now they are dealing with an after saturn-like scenario, and they are facing the massive PS4 market and the price drops to come.

The only positive thing would be if the switch is considered as an handled console and if that matters, and I don't think it will. Because of its price, the development costs, the battery and the smartphone market, it will not sell like the handled used to.

So, I agree with the OP, it will fail slightly harder than the Wii U.

If it will be perceived as a portable that can be plugged on a TV too, it will need a price cut very soon, but once Ninty will have fixed that, it will as soon kill 3DS and it will end up selling roughly the same lifetime, or maybe a little more.
If it will be perceived as a home console that you can carry around too, I really can't predict anything, it could succeed, fail or anything inbetween.
Financially, if Ninty didn't fall for a horribly one-sided deal with NVidia as MS did for the first XB, it will only need decent sales to break even and then bring some profits too, even twice as many sales as Wii U should do, as pay online will help (although it could harm sales numbers a little).

Not if you are away from the house for 8+ hours a day like a normal person with a job.

Simple solution, turn it off or put it on sleep mode or have it charging when you aren't playing it