^ Crowe isn't really much taller than Cruise, though in terms of screen personality he's a better fit for Reacher.
The Rock I could see - okay, Reacher is caucasian, but he has a French mother, so it wouldn't be a big stretch to make her French but of mixed race.
Jackman or Worthington aren't really my idea of Reacher but I'd prefer them to Cruise.
If they wanted a younger actor in the lead role, they could start with the prequel novel set in 1990 and maybe someone like Alexander Skarsgard or Chris Hemsworth in the lead. There's no great continuity between Reacher novels, so the order in which they film them doesn't matter.