There's obviously room for incremental improvements.
However, this is a very mature technology we're talking about, here...
EDITED TO ADD: And I'll admit that a great deal of my skepticism comes from two things I've seen over and over and over again:
1) Lots of great ideas for guns coming from creative engineering types who love guns, but don't really shoot guns, and/or...
2) Interesting engineering solutions coming from companies who don't worry about niggling details like quality control.
This is how we get Bobergs and Heizer Double Taps.