Canonical and Ubuntu founder Mark Shuttleworth just dropped a bit of a bombshell by announcing that Ubuntu 18.04 (the next LTS release) would arrive without Unity as the default desktop environment; rather it will come with Gnome instead.
Ubuntu invested a lot of time and effort into Unity, their "convergence" product, but I don't believe it ever really "caught on", certainly not to the degree that Mr Shuttleworth envisioned. When push comes to shove market forces even hold sway in the Linux desktop world, and Ubuntu is pulling back support for Unity as their main desktop
We are wrapping up an excellent quarter and an excellent year for the company, with performance in many teams and products that we can be proud of. As we head into the new fiscal year, it’s appropriate to reassess each of our initiatives. I’m writing to let you know that we will end our investment in Unity8, the phone and convergence shell. We will shift our default Ubuntu desktop back to GNOME for Ubuntu 18.04
Personally, I never really "got" the Unity desktop; I tried it a couple of times rather early on, and it was not a good fit for me for whatever reason - so I can't honestly say it affects me one way or the other. I feel bad for those who embraced it, and I suppose it will linger for a bit longer since 16.04 LTS will presumably continue to support it for the next few years.