Is it possible for thrombocytopenia to affect morbidity?

Yes. Platelets are little plugs present in the bloodstream which control bleeding from small blood vessels. Minor decreases in platelet counts should have no effect on most people, yet moderate decreases can lead to problems following trauma or surgery; at very low levels, spontaneous bleeding may occur, which can be life-threatening.
Yes. Low platelet counts can affect morbidity and mortality through the increased risk of bleeding. The severity of the bleed will dictate just how bad the consequences are but any part of your body could be affected particularly with platelet counts below 50, 000.