The infomercials also say you can lose 10 lbs in 5 days, and you know better than to fall into that trap, too.
Maybe you should start a new definition of a rotation? Instead of counting weeks that pass, tally up the workouts you've done! So if the "Official System Plan" says to do XYZ workouts three times a week for six weeks, YOU would instead plan to do X workout 18 times, Y workout 12 times, and Z workout 6 times. (Or something like that.) And check them off as you do them. Then instead of feeling like you've failed because their schedule was not designed for your life, you'll have a success every single time you finish a DVD.
Or make your "rotation" about how many reps you can do or how much you're lifting or making it through an entire leg on Tonique without a break, or doing all those#@^! mountain climber reps, or...
You get it. Just something that doesn't tie you to an arbitrary schedule. Make it all about what you CAN do.
I'll tell you something--men don't do this. My DH has been doing the Couch to 5K plan since November. He's still at it, even on weeks he only gets one run in. He just picks it back up where he left off, totally unconcerned about whether he's "failing" because he hasn't been 100% faithful to the plan. I might look at the calendar and complain that I only got two workouts in, where he'll look at it and go, "Hey! I got two workouts in! Good for me!" There's something to be said for that!