Excellent posts on here from mathanxiety regarding the power shift that could occur in your relationship with DH and the changes you could see in him when he moves to the US - as the PP with the Ozzie DH also noted. I draw your attn to this from BeAlert too:
Although DH Is the American, we decided together to move to the US, and I wanted to be here as much as he did. I never had any intention of moving back to the UK whether we divorced or stayed together.
If I think of all the reasons why my own cross cultural relationship with DH has worked this is a big factor for me - I had reasons to draw me to the UK apart from DH and want stay here for reasons that are independent of him. This is key. THis has not been the case with friends of mine (also in non-English speaking countries) and they have really struggled. It compounds the stress of any other cultural, practical issues you may face.
The other thing is that DH and I do not live near his parents and even more crucially, our lives are very different from what he experienced growing up. So, we are doing things together in the UK that are new for both of us, if that makes sense.
This is a very different scenario to moving back not only to your husband's country but to live near his family, his friends, where he went to school and basically enabling him to pick up where he left off, after a fashion, which it sounds like you would be doing.
I really do not think, while you are married to him, he would agree to give that up after a few years and move back to the UK if you weren't happy and I think it's important to be realistic about that. I think you'd be looking at a lifetime there.
Everything else we've discussed on this thread about taxes, schools, etc is highly incidental set against this consideration, which really is the main issue. If you like it there and want to be there you'll find a way to make it work. If you don't - it won't matter, as Math put it, how many great ski slopes you can drive to.
I am not sure that I would encourage him to do more with expat circles in the UK. In my experience, Americans who are happy to settle here are in a minority. It could make it worse to see them going back after a while, which most of them do. Again - Math:
If his UK job is not giving him joy, would another UK job help?
One thing to consider is holidays - on the one hand, the long summer holiday (if you don't work) would give you a lot of time back in the UK. But if you do work, it's one of the nightmare childcare delimmas from what I gather (lots of kids seem to go to sleep away camp; I didn't.) Would your husband agree to commit to holidays in the UK in exchange for moving there? This can also become extgremely expensive and inconvenient - and your DH might resent to.
Have you asked your DH what he would say if you wanted to move back? Would he commit to doing this? Have you asked him whether he'd be happy to commit to all holidays in the UK? I mean - I think it's fine to paint an extreme scenario and see what reaction you get. Your scenario is extreme too and like another PP said, don't make a decision based on being 'fair' to him when he has very little to lose from moving.