If MDE is the solution, then what is the problem?
The application area of MDE is rapidly broadening.
As a consequence it is difficult to answer questions about failure or success of MDE since we do not know exactly the problem we are trying to sove.
Most studies do not consider MDE, but very restricted areas like artifact generation or even code generation which is a very tiny subset of MDE. This is not even the full scope of MDSD or MDD.