Oh, there is always a cost. What we'd pay in premiums, deductibles and copays, you pay in taxes. There is no free lunch! Anyone who thinks so, is kidding themselves.
No easy answers...
But, back to the point; yes, the chronic inflammation/disease does not have to be in the pouch or even the GI tract to affect blood cell formation. We tend to focus our attention on our pouches and sometimes that blinds us and our doctors to other issues. Having a j-pouch does not make us immune to other problems, particularly autoimmune. Many of us have developed other autoimmune diseases.