It's a no-brainer really Peter...and I can't believe this argument is still getting airtime, so I'll try and put it to bed for you. But I'm not that optimistic that I will get through to you and some others.
By my calculations Robertson has played in 79 first grade games and scored around 40 tries - essentially one try every two games (and a big chunk of the last two years spent playing out of position) - since David Williams made his first-grade debut in 2008. And of course Robertson has now played 138 first-grade games (for Manly) in a row and in every minute of every one of those games.
Williams, wonderful player that he is when fit and in form, has played in 40 games since making his debut three years ago. He's scored 27 tries and kicked two goals in those games. Great effort - but if he was as robust as Robbo, Williams would be up around 80 first-grade games by now and presumably would have scored many more points. But he hasn't and therefore he is a more logical choice to leave at the end of 2011. Don't you think his non-selection last night is the best indication of where the coach sees his value vis-a-vis the likes of Robertson? He wasn't rushed back into the team like Stewart was he?
I'd swear that if the Internet had been in existence circa 1979, there would be some Manly fans wishing the Club would release Tom Mooney to retain someone younger and quicker like say - Manly junior (of that era) Chris Montgomery. Qualifier: there was no salary cap back then.
That would be the Tom Mooney that sits fourth on Manly's all-time first-grade try scoring list, just ahead of Cliff Lyons. The same Mooney who twice topped the try scoring lists in 1976 and 1979 - the latter a year when Manly didn't even make the semis. Robertson is similar to Mooney as a player (nowhere near as fiery!) and he is surely up there with Mooney as one of our best ever wingers.
So please, just recognise Robertson for the great clubman he is and continues to be and will continue to be for several more seasons. And ponder how many more games we might have lost without him in the team in 2009 and 2010, whilst Stewart was unavailable.