I hope it works out for H&M but I'm afraid I don't see a happy ending for Harry ultimately. They got their freedom but not on the terms they were hoping for - as Harry has admitted and I wonder how Harry in particular will fare. He has to step down from his honorary military positions, now has no public duties and cannot use his HRH. In short, his status has dramatically diminished overnight.
I know there is talk of amazing deals with Netflix etc. but in all honesty, other than the fact he is a prince, what skills would he bring to the table for a post royal life? He's not a businessman and he doesn't have the accomplishments like say, the Obama's if he's thinking of paid speaking engagements or book deals (for that matter neither does Meghan). Their desire to still be part-time royals reflects the reality that they know their value came from being working royals. There will be a buzz around them for a limited time I think but I honestly see them fading from relevance after five years or so.
Sadly I think Harry will struggle to find meaning and duty in life if he can't convert this move into something fulfilling. He'll be self-exiled from the UK, far from family and friends with a diminished status as the royal who "quit" which may well bother him for the rest of his life.