It all depends on the implementation and execution. But even then, there are certain things that is near impossible to upgrade easily that will bottleneck the console like the CPU so... Probably not.

Who's going to be the main target of the upgrades? Because Sony and Microsoft have a lot of 3rd parties complaining about power, but with Nintendo, it's not a matter of power as much as a problem of userbase and target demographic.

Nintendo themselves won't really need that much power, and the 3rd parties interested in the NX probably won't either. Hell, even big companies whose games are on every system were reluctant to port o the WiiU during its first days, and most of the ports were from the PS360 versions. And if the NX is not as powerful as regular PS4, the feeling is going to be the same.

More choice is always good for consumers, some companies don't like that very much though.

Neither Sony nor Microsoft are doing upgradeable consoles, they are just launching new consoles that are 100% compatible with the old ones and keeping the name.

A PC, where you can simply change one of its components to enjoy a more powerful machine, is upgradeable.

On the topic of the NX, first we should know what exactly is the NX. If it's a "handheld that connects to the TV", I ind it hard to imagine how the console could be upgraded without launching a new machine.

If it also has a dock with extra hardware, maybe that could be upgraded, although that will depend on how will Nintendo use it.

NX makes perfect sense to be upgradable if they're going to do the hybrid thing. Just buy a new dock, plug and play, if you want better graphics then you can pay more.

It's a fair compromise for ALL users, rather than locking in people to lower end graphics for 5+ years for no good reason.

Also there are rumors that Microsoft's Scorpio is a modular, upgradable console.

You just have to make it easy and simple to upgrade, plug and play, just like the N64 Expansion Pak, even easier than that if need be. 

I would love that!

I really loved N64 (look at my picture) with Vibration upgrade and Ram upgrade, Nintendo even had disk upgrade for N64 in Japan. IMO it make console more interesting and somehow more valuable with more options.

I hope those Nintendo patents for potentional ugprade are part of NX.

If the NX is a tablet which produces 720p graphics while portable or used in the VR headset but when fitted to the dock a fan system in the dock allows it to run faster for 1080p TV hdmi graphics then perhaps later a NX 1080p tablet could be produced that can do 1080p without additonal cooling based on a smaller fabrication process for portable use and still remain 100% compatible. I guess it will have a SD card slot for upgradable storage.

To be honest though you don't buy Nintendo hardware for the spec normally as its generally terrible for the price. It's about the game experience. Far less pressure for Nintendo to offer upgrades.

The NX as a 3 way portable, virtual reality and home console system offers good portable performance, average to low VR experience and low home console performance. It's all about having 3 ways to play the same games. You don't need state of the art hardware for some virtual reality mario kart.

I don't think VR is going to happen. 720p is too low of a display resolution and Miyamoto shit on VR again by saying no to Mario on VR:

http://www.usatoday.com/story/tech/news/2016/09/07/mario-creator-miyamoto-pokemongo-george-lucas-and-bluegrass/89977912/

I think the "gimmick" outside of the hybrid portable nature of the system will be the detachable side controllers. Nintendo and 3rd parties will be able to make all sorts of different controllers that can change the controls for different games.

It's very toy-like and very much in Nintendo's vein.

Amazon are certainly expecting it to be VR and big retailers like Amazon often get information from console manufacturers before consumers for obvious reasons.

https://www.vrfocus.com/2016/08/amazon-to-launch-vr-stores-on-playstation-vr-oculus-rift-and-htc-vive/

It's only a 1080p panel in the Playstation VR set so for a more budget orientated VR system 720p is fine  not that we know its 720p it could well be something like 1600x900 so 800x900 per eye.  Not as good as 960 x 1080p per eye but hardly a world apart. Admittedly more like 1280 x 800 though which is 640 x 800 per eye. Tablets with those panels are as low as £40. Remember this will be  basic entry level VR system above google cardboard type VR but not as good as dedicated VR visors.

All nintendo have to do is fit the required electronics in the tablet to respond to head movement etc.

Pretty sure VR is likely to be in the mix otherwise I think its going to die horribly without an appealing new feature.

It seems Nintendo really don't think that VR is currently yet ready for living room, far more better chances are that Nintendo actually with NX goes for AR.