I'm guessing that the immune system will reset itself as the toxins are purged. I don't want to suggest that the immune system becomes weaker. I think it just goes back to the way immune systems are supposed to work. For the people with hyper systems, it would mean getting the occasional illness again. For people who have exhausted immune systems, that would mean stronger systems and fewer illnesses.
If I have to choose between feeling bad all the time but never getting the flu or feeling healthy but getting the occasional common illness, there really is no contest. I consider getting the occasional illness a fair exchange for overall better health.
I wonder if anyone else can suggest if this speculation is true or not.