This sort of thing should have become standard by now
Certainly for decently specced laptops and all modern desktop PCs, you should get this sort of functionality out of the box as standard in an easy to use and manage way.
So, on booting up you get a menu (easily custpmised in case you really never want to use anything other than Windows, which is becoming less and less likely as there are really great apps around on Android, even for free) and boot simply into Windows, Android, ChromeOS (not tried it so don't know what it's like), Linux, whatever. Make downloading / installing new OSes really easy and simple from this menu too.
Having gone the virtualization route myself. it's still too slow and complex to manage for regular consumer use, so a multi-boot partitioned system seems the only viable solution right now.
As so many people now also (or even mainly) use tablets, these Acer products look like the first step in the direction that people are starting to demand and I can see traditional single OS machines becoming a thing of the past, especially after the Windows 8 disaster.
So PC makers, stop whining about declining sales, get to work and get these things on the shelves asap.