Not a good idea at all.
When I turn on my TV I know where I want to go and I don't need more advertisements from Verizon. Heaven knows the service is costly enough that it doesn't need to be supplemented with ads.
It is bad enough that they hawk On Demand Movies and Internet Speed Upgrades, Home Security, etc. on the Channel Selection Menu. Additionally, if for some reason I leave the room for a bit and turn the TV off and then come back in and want to get back to the live show I was watching as soon as possible, I now have this additional delay.