The 7mm WSM despite its relative lack of popularity would go close to being the perfect big game cartridge for me. Great ballistic profile bullets at way over 3000fps, in a shorter, stiffer and lighter action than the 7mm RM or 280 Rem. Magazine capacity of 3, hardly an issue. I've done plenty of walking up mobs of pigs and shooting them in mobs from a car too. 3 in the mag and one up the spout is enough provided you can either top off via the open breech or whack in a fresh mag. Name a long magnum that has a bigger mag capacity than three anyway.
A shorter action is a stiffer action and that's never a bad thing. It also means a little less weight and that's never a bad thing. It MIGHT perhaps bring the cost down a poofteenth as someone above suggested. If that was the case, that's never a bad thing either.
I think SOME of the short magnums are a better mousetrap. Some of course are like 90% of cartridges, duplications of an already crowded niche.