I don't have a problem with continuing the show longer, but it IS starting to seem more and more ridiculous that Dexter hasn't been caught yet. Especially considering he works alongside so many smart detectives and cops every day,
I'm starting to think the original author had the right idea by having Debra find out the truth earlier. Having that extra person to help cover him would make the situation a bit more believable, I think. And it would make things a LOT more interesting between the TV versions of the characters as well.