If you look at Facebook and Google's popularity throughout the world, I think it's obvious that language isn't really a barrier to their spread and popularity, outside of some Asian countries where politics are also a factor.
I guess I'm just not scared of there being people speaking Spanish in the US. Over time, they'll integrate, just like everyone else has in the past.
Personally I think it's great since I view the fact so many Americans never have to learn or even really be exposed to any other language is a big disadvantage.