I don't think EV SSL certificates have been a big success (though that's just a personal opinion rather something backed with specific data)
For me the differentiation in the browser presentation of EV against ordinary SSL doesn't provide much additional security. Most users don't notice the difference and even if they do, wouldn't remember which sites had an EV certificate, such that they would notice it changing back to non-EV
I wouldn't login to my bank's website if it didn't present me with green EV url bar. Same with paypal, amazon and basically anything to do with money has to have EV for me. I might be slightly paranoid, but I thought the point of ssl was EV.
For me the differentiation in the browser presentation of EV against ordinary SSL doesn't provide much additional security. Most users don't notice the difference and even if they do, wouldn't remember which sites had an EV certificate, such that they would notice it changing back to non-EV