I can see where you're coming from, but I still liked the episode, and the same with The Lodger, and I think it's reasonable that Craig survived when he did. To start, Craig wasn't just being converted, he was being converted into the cybercontroller, which is why he actually could overload them with emotion - they were to obey his every command, and when the internal surge came, they couldn't cope and they overloaded. A little cheesy, yes, but believable. Also, if you want to be technical about it, Craig did it by some means the Doctor was trying to explain, but was too complicated for his simple human mind to grasp, and so he gave up trying to explain and instead just said "Yes, love" because that was easier than trying to explain nuclear physics to a sloth.
I think Craig dying would have been an interesting thing, but would have been lost on the vast majority of the audience, keeping in mind that it is a family show, so the nuances of poor Craig dying would have been a bit bleak for the eight-year-olds in the viewership. What would have been interesting however, would have been if Craig had been converted in all but mind, keeping his human mind in a cybercontroller body, with some deus ex machina getting rid of all those pesky cybermen. Having to care for your child without ever being able to hug it without electrocuting it or crushing it to death would be interesting.
I think Craig dying would have been an interesting thing, but would have been lost on the vast majority of the audience, keeping in mind that it is a family show, so the nuances of poor Craig dying would have been a bit bleak for the eight-year-olds in the viewership. What would have been interesting however, would have been if Craig had been converted in all but mind, keeping his human mind in a cybercontroller body, with some deus ex machina getting rid of all those pesky cybermen. Having to care for your child without ever being able to hug it without electrocuting it or crushing it to death would be interesting.