I wish the 17 WSM would spawn some better rifles, CZ, Ruger American and a proper Savage like the 93. Then a 6mm version on the WSM case would be the next logical progression, heavier bullets with some hit. Sure, .22 and .204 on the WSM case would round out the line nice too.
The 5mm Rem Mag is a great round, but incredibly obscure. I've got a 591M, and 8 rounds left. I've jumped heavy on the WSM bandwagon, and I love it. My Bmag is a horribly designed POS, but shoots incredible. I've got a Ruger as well, but despite lots of messing around, I can't get performance anywhere close to the Bmag. I've got a Lilja barrel I plan on throwing on it at some point.