Hah! As the only person on the Internet who wasn't into Sherlock, I would welcome a new Lord Peter adaptation, even if it made use of the same tropes ;-)

There one aspect in which Sherlock and Lord Peter definitely differ: Lord Peter is almost aggressively personable. Sherlock makes a point of not getting on with people (with the exception of a select few), Lord Peter relies on his charm and his people skills a lot. I would like to see how this is handled on screen - investigators in contemporary dramas tend to present themselves to the world as caustic and misanthropic, whereas Lord Peter would have to don the outgoing, foppish persona.