To be honest, back in the days of the release of EfMI, I loved that plot-twist. Sure, I was just 11 years old, but still. I didn't really think of what it all meant; I just liked that he turned out to be more important than he seemed.
And yes, I read all that, Doolo. : )
And still, I know that the original H.T. Marley and Herman were not the same personalities. Marley was brave, heroic and proud, and Herman is whimsical, senile and pantless. To see basically a new character (a mixture of them both, so to say) featured in some way would definitely be the most interesting way to keep him in.
I just don't want his story to end, I guess.