I’m going to be the a-hole here….
Wow, you’re really worried about holding back a 6th grader on the 1% (yep go look it up) chance that your son may play college ball and then be redshirted. Based on the number of 11Us playing LL alone only 1% of them go on to play in college ball. If you start to factor in all the 11Us across the country playing travel, PONY, etc. I would guess its less then 1%.
Right now the only thing you should be worried about is enjoying your kid playing baseball. I can tell you from experience I had the stud 11 YO in the area. Kids were scared to step in the box against him, he was walked about 40% of his ABs as no one wanted to give up the HR to him. Fast-forward to 2014 and his sophomore year in HS. He is still a very good player and is starting to garner some interest from some colleges but everyone else is closing the gap.
Fortunately for my wife and I we remained grounded, as did our son. My wife works in a field that requires her to have a very solid understanding of childhood development and we were able to keep perspective. You will have no idea how good of a player your son is until at least their freshman year in HS. Some will argue moving to the big field is the difference but there is still a lot of growing to be done between 15 and 17/18U.
There is no reason to hold a child back on the off chance he may actually play in college. Unless a kid is struggling academically or socially you may very well do more harm then good to them by holding them back.