Although I never actually came to like McLaren as a team (that comes from much before Alonso got in, including those horrible race days where newbie Raikkonnen would be hit by Montoya) since I always found it to be quite unorganized in a way, more like contradicting itself than being not well thought up, but I kind of liked Ron Dennis thinking he was a nice guy who would work a lot for his team, and not just a guy that 'is there barking orders everywhere'.
Even though last F1 season took a big dip on his image and destroyed part of his 'savoir-faire' looks, I am still convinced he's a good guy to who events have gone off the rails, thus him not being able to fully control the circus his team has come to be thanks to both his drivers and one of the driver's father.
Even though right now it's the right decision both from familiar point of view and the right professional moment (it was rumoured that Mercedes wanted to buy the team quite a while ago), I think he will still be there, in the dark, helping the team in a way similar to what M. Schumacher is doing by helping Ferrari.
All in all, another person who has been part of the story of F1 is going, one year after Schumacher went away, so I say :
'Let the new generation make history'