In my opinion (for what it is worth) an effective cure for type 2 diabetes would have to eliminate insulin resistance whilst there are still enough beta cells to handle any glycemic load up to an OGTT. Fasting and post meal BG levels should be in the normal range, as should the HbA1c, without any major dietary constraints. This would, of course, recognise that you have a metabolic vulnerability which led you to develop T2 in the first place and thus it could return if you abuse your system repeatedly. I see that some people would require a return to full functionality of the pancreas. I would consider it a cure if the pancreas still had enough functionality to last out the rest of my life. Everything wears out eventually so if my pancreas was in line with everything else (apart from my knees) I would consider that effectively a cure; or so close not to be worth arguing about.