No, he's far from legend.
If city wins a couple of titles in the next 2-3 years, then every single player of our last year's squad may become one :) The new ones have still to prove them worthy.
But in current form, if given enough time on the pitch, I'm sure he would build on that status. The equilizer against QPR made a good base for it. And this year will be very important, as Roberto would say it. I'm one of Edin's biggest fans,but I would like him to stay with city and prove his quality here.
As I don't have rights to create threats on my own, some thoughts about Bosnian fans discussions here:
Guys, if you still didn't realize it, you're becoming a damn famous football club ;) Be prepared for it that some kind of migration will happen now and then, let' say when you sign a player from some country comparable to Bosnia. They'll come for some reason, many of them will go when that reason is gone, but some of them will stay. And those may become a true city fans. Could be of vital importance when we're playing CL.
And I can imagine, it's hard for the British to really understand us and our madness for Dzeko. In your history, you had so many world known personalities, enough to be Idols for generations. And how many Bosnians do you know, beside other players? Edin is really a complete personality one can identify with. Our recent history is rather bloody (don't want to talk about the bloody part of Br. history), and Edin is a light that shines. Our Diamond. It's hard to understand :)