My husband told me last night, why don't we all speak english in the world?\nI have been thinking about it and i believe that sooner or later the human kind will use english, it is so complicated to learn french, spanish, german, wow we got english, so easy to learn and practical. \nwell i think im kind of sleepy now, see you tomorrow my friends!
Yes there is possibly more English speaking then any other language, yet I doubt it would be spoken all over the world, because nationalities want to keep tradition and want to speak in their own language and not a strange forgien one.
I learned a good deal of Spanish, just living in California, and working with mostly hispanics.  I think the best way to learn Spanish is to be around nothing but Spanish-speaking natives.  You would learn Spanish the fastest, by studying a Spanish book (from your schools library or Spanish class) and taking a 6 month vacation to a non-tourist area of Mexico, and just try to make some friends.  This may not be practical, but you would learn the dilects and 'figures of speech' etc. that cannot be taught in a textbook.