Personally, I think it would be an absolute shame if Harry wasn't involved in Invictus.
However, turning it into the Meghan and Harry show was a disaster for Invictus, but I do believe he could come back from that, he needs to go back to basics and make it about the veteran sportsmen again, and move away from his and Meghans' celeb promotion type of event. .
Also, I know this was brought up before after an award Harry accepted, he rarely, if ever, attributes any appreciation to those who really do make Invictus happen, those who do the ground work. I only knew the name of the CEO because he resigned.
He should consider making it less about himself, certainly Meghan needs to be out of the public profile in regards to Invictus.. The self promotion is not working and it is detracting from a great cause and has brought too much ridicule to the games and the Invictus games foundation itself. The questionable finances need to be more transparent, so they can put to bed the rumours that Invictus financially supports the Sussex's.
Invictus needs a full overhaul to get it back to good standing, I think with the proper guidance his patronage could help it continue and grow.