It wasn't addressed whether they could have found another world to terraform. Basically, Zod didn't care about the humans, started attacking, and Clark wouldn't have had had any opportunity to suggest the idea even if he'd thought of it.
I definitely still think it took at least a couple weeks for Lois to track her mystery man down, but the timing with Perry is weird. Maybe she had the blogger hold the story for a while? Or maybe she's been AWOL those weeks, and this is the first time Perry's seen her to chew her out?
I also stand by my earlier assessment of Jonathan: "There's more at stake here than our lives and the lives of those around us. The world finds out what you can do, it's gonna change everything, our beliefs, what it means to be human, everything. You saw how Pete's mom reacted, right? She was scared. People are afraid of what they don't understand."
