The problem I see in this discussion is most people that are pro Continuum don't know what is already in the market that realizes their speculation about what Continuum will be in the future and confuse two things: That smartphones are reaching the processing power that can be used to replace a laptop and desktop in standard productivity tasks and what is needed to make it work.
Furthermore when presented with real Android based examples from Motorola and Asus (interesting that MS just settled an agreement with Asus for cross using copyrights) that they can buy now that actually realize what they have written about what will be Continuum in the future according to them things go a bit crazy. Stating that the advantages of Continuum is its apps, when actually the app store sustaining Continuum is the same as a Windows Phone. Weird.
Anyway, maybe this thing has not catch up with Android because it did not have the right support from Microsoft and Google. But I think the issue was mostly pricing to which consumers were not willing to pay much to have this kind of feature and always found better alternatives for the price. Something that is underlying every pro continuum post ... low price, really low price. Will see.
The implementation on Android is not at the level Continuum will be. A few companies are realizing the potential of Android, but those are mainly on the fringe that aren't succeeding in other areas. Asus is the exception, not the norm, and Motorolla, I'm not even sure why you're bringing that back up everyone knows what happened there. I actually have an Android desktop, 21 inch, running JellyBean, and I do everything on that desktop, and there are a few things that I want to do with it I can't, because I would have to root it and try to get a newer version of Android running on it, and this includes running Office, which this desktop would be great for.
It is not a matter of who does it first or who did it first, it is a matter of who does it well. Continuum would be the first "Apple" like situation with Microsoft where people can say, "yeah Microsoft did it better" or "I like the way that Microsoft extended the reach of the smartphone into the desktop using Continuum". The idea is not new, but there hasn't been this level of excitement for this since Ubuntu tried it a few years back.
What has been done with Android on the desktop so far is just uninspiring, and that probably is not Android, but the understanding that the companies that have tried to make an Android desktop have of that OS, so we'll see how things go and what Microsoft is actually able to pull off.
And the reason why we mention low price is because Windows Phone has proliferated, and has been evangelized, through a low price strategy. Do not mistake that as a suggestion that die hard Windows Phone fans will only buy cheap devices, or that they will only try Continuum on devices that fit within their budget. We're just stating the obvious, that Continuum will take off in a major way once it is available on cheap devices, seeing that those are the majority of Windows Phone sales, and the majority of devices running Windows out in the wild. No different from Apple or Android; the more expensive devices run the latest OS, and the older devices are not able to be upgraded to the latest OS, and therefore the cutting edge technologies are not avialable to most, unless they're willing to upgrade. So Continuum MIGHT be available on 5% of the Windows 10 devices once Windows 10 makes it to phones. It could take a few years for it to trickle down to everyone else, and obviously many will simply need to upgrade.