While it's sure fun to think about, the reality is that Marvel Studios will almost certainly cast an actor much younger than the 48-year-old Urban to play the next screen incarnation of Wolverine. The X-Man is one of Mighty Marvel's most popular characters of all time, and Marvel Studios will want to lock someone into the role capable of holding it down for a long, long time — you know, like Jackman did. Having portrayed Wolverine for 16 years and 228 days, the Australian actor is in the Guinness Book of World Records for the longest stretch playing a superhero in a live-action film series (via BBC).
For that matter, despite the big names that have been thrown out during the Wolverine fan-casting fest, it wouldn't surprise us to see Marvel go with a relative unknown for the role — again, like Jackman was. Before being cast in the role of a lifetime, Jackman had appeared in only a handful of Australian movies and a pair of feature films from Down Under. That choice worked out pretty well for the X-Men movies and for Jackman, who subsequently became one of the biggest stars on the planet.
At the end of the day, we're pretty sure that Urban will only be cast as Wolverine in some alternate universe. Come to think of it, there's an upcoming Doctor Strange sequel that will deal quite extensively with alternate universes — maybe somebody could talk Urban into a cameo?