I was finally able to cancel my phone without causing incurring the ETF that Sprint wanted to charge. However, they would not allow me to cancel my wife's phone for the same reason because she just got her phone last November (I got my phone in October 2011). This means that I was able to transfer to my phone to ting.com and changed my wife's plan from a family plan to one of their new individual plans until it makes sense to cancel her's altogether.
I am ok with this for one reason. Switching over to ting seems like a risk and switching my phone first, allows me to test the service before we switch over both of ours. The main issue is Sprint didn't charge for roaming data (since their network sucks, this is probably a necessity) and ting basically does not allow it. However, after a week of using ting.com, I'm happy to say I haven't noticed much of an issue. Roaming calls still go through and are free still, so that was my main concern. My bill is tracked by the amount of usage I actually use so the less I use data, talk or text for a month, the lower my bill and I can also set alerts to tell me I'm approaching certain limits. I'm figuring my usage will end up costing me about $31 - $42 per month + charges, which is much cheaper than we're paying for my wife's plan.
I'll keep you updated.