The 'blue dollar' market exists because one cannot freely buy foreign currency in Argentina. The 'blue dollar' market is the result of an idiot government's idiot attempt to curtail the possession and use us foreign currency.
If - one sunny day far into the future - it is again possible to freely buy foreign currency in Argentina, there is no need for black, blue, green, orange or yellow currency markets. Compare to e.g. Chile, Uruguay, Brasil, and just about any other countries in the world, except e.g. Cuba, Argentina's Next-Step-Venezuela, Zimbabwe, ...