I have nothing against Conner, but I'd much rather have Kara in a MOS sequel than Superboy.
mainly because his backstory would be too complicated to fit into the narrative, especially in 1 or 2 movies. you wouldn't do the character justice.
if they want to go the clone route, then do Bizarro.
Straight Edge and Proud!!
Original Hype User Name: Super-Bats