I'm sorry, but as a type 1 diagnosed in 1966, I think you are worrying far too much. There is nothing stopping your son from achieving all his goals in life. He is not going to die an early death unless you didn't teach him to look both ways before crossing the road (along with texting while walking). Sorry if I sound flippant, but my suspicion is that maybe you are putting some limits on him. And as for other people? F-them. If they try to comment or give advice ask them what their qualifications are - CDE? RD? MD? Otherwise you will work with your own medical team to take care of your child.
So, in my mind, what you need to do is that all of the family needs to know what to do. How to test. Count carbs, know insulin to carb ratios, basal rates, etc. Pumpin is amazing and something to consider. And while your son is more than capable of learning what to do to take care of himself, it is also important that you take the burden from him if it becomes too much. Diabetes is a lot of work so if he wants you to give him a shot (especially if he's sick with something), count his carbs, or whatever, make sure you know how to do it.
otherwise, the most important thing you can do is typical parental stuff. Homework, activities, friends, sports, etc.
If you need better info and more detailed, I would suggest the books "Think Like a Pancreas" and "Using Insulin". It will help you customize his regimes. Also "Pumping Insulin" if you decide to go that route.
Remember, latest studies show that type 1 diabetics live pretty much as long as anybody else. Would you believe that the Joslin center (THE place in the world for diabetes research and info) has 50 and 75 year medalist awards. These are for people who have lived with type 1 for half, or three quarters of a century.
Not only would I check with the doc, would consult my local chapter of the ADA. They may have some resources for you. Also, do you have an organization that helps folks similar to yourself with low vision? In Canada we have the CNIB that has a load of helpful devices.
Sorry I can't be more help. Oh, and your pharmacist might know of something or someone or a group that can help.
If you patched a leak in a hose, and it was no longer leaking, would you take the patch off and expect it to be ok?
If his blood sugars are normal now, they are that way because of the insulin. If he begins to go low, then yes, by all means, adjust downwards. it is possible to get off insulin for SOME people. But you do it because you are going low, not because your blood sugars are normal.
My next question is whether or not your son has been tested for type 1? It is possible at any age and if he actually is type 1, and stops the insulin, then the side effects could be hospitalization and even death due to high blood sugar.
The most important thing with diabetes is keeping your blood sugars in a normal range. It basically doesn't really matter how you get there. Being on insulin doesn't make your diabetes "worse", it just means that your pancreas may be damaged in some way.