A big issue is that a lot of the buildings are completely useless but actually look kind of cool. If there was a way to remove the coin/goods icon from the buildings you could still have them in your city for looks but not have to click on them or have the annoying icon on top.
Another issue is that with the limited number of clicks you get making cash to buy the wonders is going to take beyond forever (other places in the forum list $30k per day as the number that you can make). Unless something changes I just can't see playing a game for 30 days just to buy 1 item and not purchase anything else. The economy seems way out of whack.
As far as new features how about the golden gate bridge? Would look pretty cool hanging out over the ocean.