@Roussette
He won't be back ! Why would he? He's happy over there with his wife and little children and doing what he wants to do, with added freedom.
Well done them.
I agree that he has no reason to come back now and neither of them are concerned with what the citizens of the UK think about them, they are solely focused on the USA. And that's absolutely fine as long as their relationship stays strong.
Speaking as someone who left their home country for love, it isn't always easy, and it will be particularly difficult for Harry for whom a traditional royal lifestyle (eg the season, Balmoral in the summer, Sandringham at Christmas, the year's calendar punctuated by particular very British traditions such as Trooping the Colour, Remembrance Sunday ... . etc. ) has been the norm for over thirty odd years.
He may be loving life in the US ATM which may afford him much more freedom than he has had previously, but there comes a time when you move abroad that you switch from "holiday mode" to "RL mode" and you encounter all sorts of minor irritations challenges ranging from a strange brand of tea bags, different weather, to major administrative and communication difficulties. And despite our common language, the USA is a very different place to the UK, he will find certain aspects of it very alien to him, despite his wealth and privilege.
Being alone out there, without the support of family and friends will be a challenge and will place huge pressure on his marriage. Add the pressure of the ongoing acrimony that accompanied his departure from the UK ...their very different socio-economic backgrounds and upbringing ...both of them coming from somewhat dysfunctional families ... I hope I am wrong but given that the marriage has been under extreme pressure from day one , I think it will be very hard for them both to make it work.