Microsoft has tried to kill normal installers twice now. The first one was with Click Once, which only installs things in a non-privileged mode. The other one is Windows Store in Windows 8. They tried to even force this in Win RT and everyone bitched.
Microsoft is damned if they do and damned if they don't. They can't take away normal installers because people will go "WTF!! Why can't I install Super Coupon Bug!" and they can't leave them in because people will go "WTF!!! Why did you let Super Coupon Bug install a virus!".
Though I have to say at my company we are happy to remove the ability to run all installers except for signed click once installers through our group policy.