The question is, does the fact that I have fewer dents in my car make me more likely to fix the others? If someone comes along and does almost all of my dishes for me, am I more likely to wash the last few myself?
I believe the answer to that is not, as Bennett suggests, "Yes."
If someone comes along and fixes most of my car for me, or cleans most of my dishes, when I had no inclination of doing it myself, why would I stop them? If someone is going to come and fix my problems for me, why do it myself? All you have to do is wait long enough, and, like magic it's done for you!
So while it is an interesting theory, the problem is, people become set in their habits fairly quickly. If I do not wash my dishes one day, I am not really more inclined to wash them the next. Indeed, why should I? There is suddenly an almost empty sink in which to store the dirty ones.