Harry is #7 in line to the throne, so pretty irrelevant. His father, brother and nephew and nieces precede him.
This isn’t the end of the monarchy
Well, as with everything, you are the expert. I, on the other hand, don’t give a damn where he is in the line of succession. He is the grandson of the future king and that has got to be sending waves of anxiety through the court after the embarrassing implosion of Prince Andrew. The monarchy is rotting from within.