I don't think you understand what you're reading and the situation now and back in the N64 days, Nintendo are investors in the third party developers doing their mobile they're not outsourced, these comapanies are near enough first party but operate like second parties working on what Nintendo assigns them to, this is much less of a resource and cost drain because Nintendo gets a much larger share back from what the project makes. All this doesn't matter regardless because you've still not debunked anything I've posted in fact this part of your replay was largely irrelevant because you're bringing in toys and such when that's a different ball park to developing and maintaining two hardware platforms.

Your Fire Emblem argument is debunked already by Pokemon Go's amount of money made, maintaining these smaller game also costs much less than maintaining console like games.

Again portability has changed, the so called jeans and T-shirt people you're touting don't have any problem carrying around Tablets or small bags or cases specifically to carry them, we're in a different era now and Switch has changed the portable gaming platform to match the era even the more sleek design shows this. I'm willing to bet that most 3DS owners would also have a Tablet as well as many gamers in general

No it doesn't. Do you really think they would put all their eggs on one home console when their last one flopped and while they have a portable market on the order of the 60 million?

I mean cmon... is that not a clear picture to you? Why do you think Nintendo would settle for a home console instead of a portable?

There might be merit to the sugestions that a portable switch SKU might be in the cards. Whatever it is, there will be a sucessor to the 3DS, you can be sure of that. And its not the home console, wich Nintendo says IS a home console. Why do you think they bother to make that distinction?

Btw the whole having the developers on one building just meant using similar engines and tools. It never meant only having one system.

No, I think it's you who don't understand. I just don't see how the situation with the mobile developers would be any different than what Nintendo has been doing for a long time already. There still are costs involved, and this is where return on investment comes into picture. 

I just noticed Super Mario Run is made by Nintendo internally. 

How much money Pokemon Go have brouht in for Nintendo? No, I'm not talking about revenue it generated, but the money Nintendo have made with it. It is a third party game Google/Apple is taking their share, then Niantic is taking their cut, then the Pokemon Company/Creatures/whatever and what's left, Nintendo can take their share from.

Look, in order to make bigger money with mobile, Nintendo would need to make the games internally, but that would hog resources from more important projects.

 Continue 3ds support till 2020

The Switch is primarily a home console right now. I don't think anyone would be surprised to see a successor to the 3DS, but the question is what form it would take. Will it just be a Switch minus the dock and maybe with a die shrink to improve battery life, or a new device with an entirely new form factor?  I think the one certainty is that whatever it is will run the same software as the Switch. You can't honestly believe Nintendo is insane enough to go back to making two versions of every game, especially after the havok that approach wreaked on their software output these past few years. 

Terrible idea. That would mean three more years of 3DS leeching off of Switch and holding it back. That would pretty much destroy any chance Switch has of being successful.

I don't think so. Its like how Sony continued ps3 support but it didn't affect the ps4 sales so its the same scenario here. The games on switch will be superior versions compared to 3ds so it would make Nintendo more money and improve their image as well. They need to support their consoles a little longer that is their biggest problem

Not even remotely similar situation; PS4 had massive developer support, Switch does not. Switch needs all the help it can get.

3DS has already had a long lifespan.

We'll agree to disagree. But like it or not Nintendo needs the 3ds software sales and any additional hardware sales as well. What they could do is to stop selling the 3ds and 3ds xl. Just sell the 2ds and new 3ds( and xl) cause those are the ones getting the sales right now. Get rid of the extra weight and in my opinion at least 3ds can have a life as long as the ps2 without harming the sales of the switch.

3DS's very continued existence harms the Switch, as any resources spent on 3DS from this point onwards are resources that could've been spent on Switch.