butakun: I'm not referring to just taking language classes. I was referring to science in particular, but particularly non-linguistics/literature classes. Trying to take graduate-level coursework in a second language, where you may have never encountered those words before--like "analyze," "anthropogenic," or "stimuli" in the case of my research, never mind the names of metabolic routes or protein compounds--can be terrifying, no matter how you look at it. I'm saying that I don't blame students who want to take the easy road and take classes in English for an edge.
A study abroad does not have to be centered on language: studying archaeology in China, or hyenas in an African country, or Antarctic system science (where one stops first in Argentina), may include language classes as a backup for basic survival, but it is not the primary focus of the "study" abroad. Yes, an attempt should be made to experience the language and culture of the place you visit, but a country has more to offer than just that.