I emphasize with you. I've been told from day one that my little weed has a lot of potentional and it would be silly of me to just use her as a trekker/happy hunter and dressage horse when she is so suited for eventing. I've been told I should sell her to let her reach her full potentional and that my mare should be relegated to the broodmare paddock only.
You know what I think?
It's my life, my horses who I've cared for deeply and my decision. Ok I'm not a top notch rider but that doesn't stop me wanting to improve, work with a trainer, enjoy by horses. I don't think I wil ever be an eventer type but that is ok because at the end of the day, if I am providing my horses with the best possible care then are they really going to care if I don't ride them over Xc?
So, I think that if you can afford it, you do whatever you bloody well want to. Don't let others shape how you feel. You are more than capable of getting lessons on Foxy once that handsome chap is weaned. You are more than capable of providing those horses with the essentials of life and from what I've read you've got a good idea about manners and boundaries. Don't let anyone tell you you can't, especially not yourself.
Good luck in whatever you decide to do :) and keep those photos coming! He is a hunk!