I wasn't going to answer but I will to be the first to vote something other than "1."
I've shot a lot of events and protests in the last year. Perhaps it's not strictly "street" but whatever. Often times I have two or sometimes three cameras with me, with different lenses or on different formats.
One protest I did in December, in Atlanta, I had my Nikon D800 on one shoulder, Pentax 67ii on the other, and then my Leica M9 hooked to my backpack which I could grab easily as it hung tight to my chest. The Nikon had a wide zoom, Pentax had a wide to normal zoom, and Leica had a fast 50. Another one I just had two Leicas, my M9 and M6, with a wide and a normal which I switched out depending with a superwide in my pocket.
Just go shoot man.