Should this happen, the host country could eventually not only end up with lower-than-expected foreign exchange inflows but also find itself stuck with an unbalanced investment programme heavily skewed towards a sector with a very limited capacity to sustain growth.
Jokes apart, and aware that issues such as this have been very much debated over the last sixty years or so, I believe that those taken in the last few years on monetary policy and banking supervision are critical steps ahead towards a stronger union.