Countries are like companies: diversification of revenue streams is desirable. Overeliance on one product line, in a country and in a business, is a risky and unstable endeavor. As we speak, Saudi Arabia seeks to diversify its domestic industry and export capability because the Saudis are aware that reliance exclusively on petroleum exports is a flawed strategy going forward.
For countries to successfully export, they must have some "comparative advantage." This means that within the market area for the product/service, the country must be able to provide greater value than it's neighboring export competitors. This can broadly come from three sources: lower cost, niche/differentiation or higher quality. For a few reasons (currency included) Brazil is currently producing arabica coffee beans far cheaper than Colombia. The former is decimating the latter in coffee export markets. For niche differentiation, think of Starbucks. It's not the lowest cost, it's not the highest quality. It appeals to a certain segment of the market. For higher quality, think of Argentine beef. It's better than all competitors.
Argentina has done a very, very poor job developing its export capabilities the last 50 years. This is a direct result of socialism and the lack of profit incentive. When your main export products are corn, wheat and soybeans, which are commodities that all your neighbors are selling too, then you have no comparative advantage. Argentina's exceptional exports include only tango, soccer players and beef. I say that jokingly, but it's true. And that ain't much.
Argentine export policy is self-destructive. Take beef. In Argentina, cheap meat is seen as a birthright. When socialists reign, there is a lot of pressure to keep beef prices down and exports low. This damages the Argentine economy. Colombia, in contrast has no such restrictions on coffee exports. The joke among Colombians is that the domestic coffee sucks because the best stuff gets exported. This may be true, but foreigners are willing and able to pay more for Colombian coffee than Colombians are. So the profit incentive is intact and Colombia is a wealthier, healthier country for it.
The US, because it is a capitalist country where socialism has been resisted, is the world's most lucrative exporter. The US exports software, internet technology, pharmaceuticals, advanced medical devices, and cultural products like movies and music. This is the ideal export situation.These are all highly-differentiated, high margin, low asset goods/services.
The problem with export capability is that once a country falls behind, it becomes almost impossible to catch up. As far as export capability is concerned, there is no light at the end of any tunnel for Argentina, for at least 50 years - as best I can see. There are no domestic Argentine industries that are lower cost, niche/differentiation or higher quality than their neighbors (at least of any meaningful size). With nothing in development, no results can be expected.