Introduction
A proper "shoot" in MMA seems to be a rare creature. I think I saw one of them on the Sci-Fi Channel's paranormal shows. :)
While I am just kidding, it does seem that the success of shooting has dropped considerably...and/or never was that high to begin with. A few of the reasons in my opinion, are that the shoot is being done by people new to wrestling and that wrestlers haven't modified the shoot for MMA. What we are seeing is people shooting that have recently learned the wrestling version or people shooting using the setups that have worked for them in Wrestling.
In addition, the separation of training into an antiquated 1 hour of Kickboxing/Muay Thai, 1 hour of Wrestling, and one hour of BJJ method, instead of stand-up, clinch and ground, is insuring that the "shoot" remains a Wrestling technique, since the setups don't involve striking. This method of training completely ignores the fundamental skillset of shooting within a striking environment. Setting it up from striking and while being struck at is a darn important skill.
Doing otherwise violates the training law of specificity. See the Spladdle's article on the training principle of specificity here.
So what is needed, is a shoot that is adapted, modified, altered to MMA. In other words, the shoot needs to evolve. It needs to be practical, and of a high enough percentage to be considered useful.