The only way I would watch a Torchwood Season 4 is if they ditched the rest of the original cast entirely and started all over again with Torchwood 4. (Torchwood 4 is the one they lost, right?) Hey, look at that, they could even call the series Torchwood 4. Sometimes I wonder if this is what they were planning all along.
Also, still have not watched episode 5 and don't plan on doing it anytime soon. If ever. For one thing, I saw Jack, to borrow a phrase from Hamlet II, get raped in the face enough for one week. Also, I can't stand the thought of not seeing John Barrowman smile for an entire hour. It's unnatural. Finally, and most importantly, Season 3 does not exist. Nobody will ever be able to convince me otherwise.