Now in a system problem do not happen everyday. It happens once in a while and to detect and find out the root cause for it one need to monitor the application at all times. That means having a crystal clear and logical "User Interface" which should be easily accessible from anywhere. And it is this monitoring capability which is going to be a deciding factor at many sites as more and more vendors develop the technology to monitor the next generation applications. Having your dashboard accessible by a web browser is great but not enough. A heavy UI (like the one of appdynamics) will not be that useful with smartphones and tablets. The OPs guys who are responsible to have the app run without any down time should be enabled to not only monitor but also diagnose a problem in the app via their smart phones or tablets and i think this is becoming more and more important.
So my advise to all next generation APM vendors is to develop the mobile app for their UI as soon as they can. This could be a deciding factor in winning or loosing a deal as bigger and bigger enterprises move to the disruptive change you have brought in this space.