If you are serious about shooting weddings and paid gigs, having a kit full of f/4 glass is not a great idea. A 70-200mm f/4 lens(especially without IS) is not going to be an option at an indoor wedding venue without a flash. I don't care if you are shooting with a 5D mkIII or a 60D. If you are currently getting by on this lens with a 60D, then you are just scraping by. Wedding photography especially is very demanding in that the venues are very poorly lit, the subjects move, you typically can't use flash, and you are expected to capture once in a lifetime memories that are very expensive or impossible to recreate.
I think you would be better suited to either get a 70-200mm f/2.8 IS, 135 f/2 L, or 85 f/1.8 at this point - and if you have the money, also upgrade to the 5D mkII or higher if possible.
You are really walking a fine line of "acceptable" gear for even attempting a wedding, with a 60D and only one wide prime.