I know what you mean. Eventually I get burn out and when that has happened in the past, I've taken a year off. I practically did this with MWIII. Once I got interstellar camo and I sort of played on and off for a few months and got burn out. If this game continues on the grindy path its on, I may just get to master prestige like you and call it a day.
Looks great, I'm glad they've gone with a melee wonder weapon really quickly, instead of waiting very long like in CW; I just hope the final boss isn't as idiotically hard as the terminus one.