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He isn't really showing signs of slowing down yet. I think he misses an absolute maximum of 5-10 games a year even as he ages. With his conditioning hes just not going to miss much time, if any.
4th outfielders on our team are going to get a LOT less PT than on your average team. Our best and most durable players BY FAR are in CF and RF and aren't budging in 3-4 years minimum (Ichiro and Gutierrez lead the WAR charts by a considerable margin). Our #1 prospect projects in LF.
There just isn't that much PT left for a 4th outfielder. I saw swap him out for a guy at a different position with similar value and give that short-term role to Langerhans.