Tech is a vast field. We are having trouble finding a Django developer where we are. Project managers decision to hire based on this, my opinion is we should look for a good all rounder, as Django knowledge only makes up around 25% of the knowledge that is needed. Someone that knows HTML, some JavaScript, any other framework, how to set up remote servers and use a database effectively. If your only skill is Omnicore, your suggestion makes sense, but there are so many different things to learn, that having a wide knowledge base makes sense.