Recently I read an article asking, where are the software engineers of tomorrow? Written by a President and Vice-President of the company AdaCore, they lament the spread of Java as a first programming language taught on many Computer Science courses and a reduction in the formal and theoretical background that students are being given.

While I can't say I agree with every word they say (for example, they appear somewhat dismissive of dynamic languages), they certainly have a lot of good points. You certainly don't learn to be a good programmer, developer or architect by learning one or two programming languages. To do that you need to understand the whole stack of abstractions form top to bottom, be aware of many programming paradigms and understand (or at least be aware of the existence of) the theory that explains it...