That concluding scene was just riveting, but left me a bit confused.
First, did they not really convey to the viewer the state of the White's finances before that moment? A few eps ago Walt was ranting about making more money than Skylar could ever imagine; Skylar was complaining that she couldn't launder it all; Hank's medical expenses were always an "any amount, no problem" type thing; and my impression was always that Skylar didn't tell Walt about her payment to whassisface b/c $600k was a drop in the bucket. So I always figured he was sitting on a multimillion dollar goldmine of unlaundered cash this whole time.
Second, didn't Walt overreact a bit with the whole "gotta run, need a new identity STAT" thing? I mean, the whole point of the family threat was to keep Walt out without having to kill him. In time, sure, he'd need to bamf should Jesse ever be swayed, but that's hardly likely to be imminent if he made it to Mexico and back without turning. Maybe he was afraid tipping off Hank would call in Gus' threat? This feels like I missed a key line of dialogue or something...
In other news, did TerraNova suck or WHAT?