For the standalone point of the Continuum feature, that could make even more sensee with a not so expensive Tablet with full Windows 10 (I mean, there are out there some really nice and cheap Windows 8/10 Tablets with enough power and features to do things just right, and the same things you do on your pone, but with better apps, even the UWA are better on Windows 10 than on Windows 10 Mobile), just arrieve at home, plug it to a dock and BOOM!, you have a REAL full computer experience, really great! The Continuum idea on phones is pretty good, but it's of no use for people in emerging markets that can't really afford to buy a phone that expensive, they would like to buy a cheap Laptop and a cheap Smartphone and you are ready to go. I believe Continuum it's not going to be a real failure, but a lot of time is needed to really catch on the idea of having a Smartphone that can be also your Computer, but not your main Computer.
Also, I believe the "Continuum" idea is more about the "Everything in the Cloud", in wich you do your things on the go with your Phone, arrieve at home, use your Tablet, Laptop, Desktop, and all your stuff is there, ready to be worked out, or watched or played or shared or wathever you do, but without the feeling of a natural border and the phisical shells that separate one device to another, but also, that idea it's going to take a while untill every corner in the world could do that withoud expending a lot of money on nice devices and expensive Internet Plans from their carriers.
On the other side of this thread, Windows 10 Mobile has a lot of potential and future, but still looks unfinished. Try once to install one Build (don't remember the number) in my Lumia 625 (what an amazing phone) but it crashed on the instalation and need to use the Recovery Tool, Never tryed again (as it was my only phone), but really wanted to give feedback. So I only watched every other build out there and read the reviews of those and watched the Hand-Onds, and it's amazing inconsistent and weird that on some, let's say, Lumia 1520, it's working like a charm and in others don't. I say this before and gonna say if again, if they still has this inconsistence in performance on the devices they are targeting to bring the OS, the OS it's not ready, and it's amazing they got this situation with the launch day so close, and so close I mean to the launch of Lumia 950/950XL, those are gonna be the first devices to get the "RTM" Build of Windows 10 Mobile, and that is when I reffer to "Launch Day". If Windows 10 Mobile magically gain an amazing, but absurdly amazing performance consistence in the "RTM" Build, also a lot but a lot less bugs and everything working just fine, that would be pretty amazing for us all. I believe, us, the fans, the mayor concern right now it's that Windows 10 Mobile it's going to be good or bad. Windows 10 is good and it's getting a lot better, let's see if they can do the same with Windows 10 Mobile. I hope so, but it's kinda hard to have a lot of expectations on this.