This time around, for many customers Cv won't renew 1 year discounts. They seem to know you'll be paying a higher rate w/ Verizon since Verizon raised their rates. So you'll have to play both sides on this as you suggest- but porting your number incurs a $40 charge by one or the other company so.. if you're gonna go.. make sure you get the best deal upfront. Personally, I don't like my phone service to be a punching bag switching back and forth so I've gone 3rd party voip. You can lose access to your phone line for upto 3 days while they port it.. Go with a provider such as Ooma and you'll save in the long run.
Expect a $10-$20 savings on average from cablevision over Fios. More than that isn't possible w/o cutting back services. I cancelled video out and haven't really missed it. Single & dual play services are going to get more popular as time goes on. Many more channels are streaming on the internet.. go look for yourself! Then decide whether a $30, $50+ video subscription is worth it..
I stream ABC news on the internet, and they're nice enough to cut out the commercials for you