I agree that Sphere is gone within 12-15 months, and possibly much earlier, but what I was trying to convey is that the full range of applications for Glassware/containerization won't be known for a number of years as the MSFT containerization program mgr alluded to in an interview at the Ignite conference a few weeks ago.
If Glassware is viewed as a beautiful flower, what we have seen so far is just the beginning of it opening it's petals and it's beauty is still just an expectation. The bloom will happen quickly and the beauty will be rare in that it will continue to improve for quite some time.