While there seem to be mixed feelings on such a system, if perfected, such a system would be great to have. Unfortunately, there are a lot of current issues with the system for some people, sometimes making it more of an annoyance than a good benefit.
If Treyarch can find a way to make it so that some of the common issues Infinity Ward experienced with the system were no longer an issue, then I think the host migration feature could be of great convenience, especially when you're doing rather well in-game.
Otherwise, I'd say just keep it out.