No, but from what I understand one of the main reason the various manufacturers have these custom UIs is for the experience. Some people like MotoBlur, some like Sense. Without these custom UIs there'd be no particular reason for the average level consumer to favor one phone over the other, and it's the average consumers who make up most of the phone sales. In my mind it doesn't make sense for HTC to not continue using Sense to differentiate the phone from from a Motorola unit.
I think what I'm saying is that the UI and experience of the Sense or MotoBlur is the selling point for the majority of smart phone sales. When it comes to the technical minded people who buy the phone on it's hardware merits we don't make up a large portion of sales.