I'm almost tempted to post a reverse AIBU on your behalf (but I think people would notice!). Thing is, if you did, you'd be asked all sorts of questions about childcare and what expectations you have that he will cover this whenever you have to travel for a competition, about opportunities for his career development and fulfillment, about family time, your relationship with your DCs, and the money questions would be more pointed - who is paying for the golf lessons, for the DCs' treats and holidays, for your pension, what is your five year plan, what agreement did you make when you got together and again when you had DCs. Altogether you'd be viewed as irresponsible and your DH would be praised as a saint.
The reality is that most female sports and arts professionals, even in careers where people peak late (crucially, the ones that peak in the teens and twenties are not relevant here, there's less inherent compromise) are single or childless, at least until after their career. They just wouldn't or couldn't expect a husband and children to trail around after them or keep house happily while they're forever busy, and might not want to compromise family life in that way themselves.
Your DH is immensely lucky to be able to have a family, as well as pursuing his dream career. He really does think he can have it all, doesn't he! That does beg the question, what was your agreement when you had children? Did he want children?
I really sympathise with your wish for recognition and some gratitude. You aren't saying you want him to abandon his dream, just to recognise that he couldn't have it all without your considerable support (practical and emotional as well as financial) and to apply some realism to planning for the future.
I understand the wish to let him pursue this dream to its natural limit. I actually wish my musical relative had pushed further, partly to capture any tiny chance of success but also because otherwise, at some point a natural limit would have been reached and 'failure' (i.e. not quite being one of a brilliant, lucky, tiny elite) would have been recognised. It is important for the person to recognise their own failure / limits. Otherwise they may become an embittered dreamer 'I could have been a contender but for...(select convenient external factor)'. You don't want that factor to be you.
I think you need to be firmer about asking him for a five and ten year plan. You can put this in terms of concern for him; what if his chances are blighted by injury or other circumstances beyond his control, despite his brilliance? Can you set out the family finances clearly, for him to look at in his own time, on the grounds that you're concerned about inability to afford something for the children and would welcome his input on the best way to alter the figures?
In terms of career fulfillment do you have a reciprocal agreement, whereby, once his brilliant career is established or over, you get your chance to re-train and do something more interesting?
I get the sense that, if he wanted to spend Saturdays doing a coaching course, or administration qualification, as part of his back-up plan, you wouldn't be resentful at all.