Coming from Greece and currently working in Australia, I see what you mean. Nevertheless, even if there is opportunity for creation there is no such opportunity for survival. When you are in a market with shallow liquidity, the best intentions will not get you far. The near-shoring of course (absorbing liquidity from outside your country) is a potential solution, an attractive one too, but there are significant obstacles still. E.g. the fact that Northerners have attributed all woes to the mentality of Southerners is such an obstacle.
Therefore, you may find opportunities as a Dutch with Portuguese or Spanish employees but I would not expect the same access to market for a purely Greek, Spanish or Portuguese entrepreneur. I assure you that as a Greek I hear derogatory comments even by people who can see and witness the quality of my work. The best case scenario is when they consider me an exception amongst the Greeks. I am not one.
Accusing those who leave that they do it selfishly is not very nice. I can assume you selfishly want the best developers (those who can find work abroad) work for the 500 euros or whatever you offer. It is a crisis and the best anyone can make of it is to survive and in the process work to get the necessary experiences to go back when the conditions are better.
It is a crisis, and the 200-300 euro slavery northerners envision for us is not the solution. It is the problem. If as the "Dean" told you, people avoided risk, they would not risk moving either. The grass is not greener. The money is more. After all, EU is supposedly encouraging mobility. It is a free market, or is it not? Are only companies supposed to move?