I beat it!
I had both lung and liver mets at diagnosis (along with a good-size rectal tumor). I had surgery for the liver mets first (along with removal of the rectal tumor) and then my oncologist quickly put me back on chemo. Three months later I had double lung surgery to remove the mets from both lungs plus an ileostomy reversal.
It sounds like your husband had a good response to the first wave of chemo so there's no reason to think he won't respond again. Once the lung mets start shrinking your oncologist can arrange for an appointment with a thoracic surgeon to see if they can be removed via surgery or RFA.
Tomorrow ask the oncologist how much the mets have grown (percentage-wise) and if he plans to use the same chemo regimen again. Also ask what is your husband's CEA so you can see if it's elevated. Ask if the mets shrink (after a few rounds of chemo) if your husband can be referred to a thoracic surgeon for lung surgery or to an IR doc for an RFA evaluation.
Be strong and don't lose hope. Sometimes you don't realize your own strength until you have no choice but to be strong. I'm proof that good things can happen in the darkest moments!