Buckfever,
Yes, Remington is currently offering .35 Whelen in 700 and 7600.
Whether other companies offer the chambering will depend on how well Remington makes out on sales, or Adams & Benett.
I have a Savage 114 in the shop getting an Adams & Benett barrel put on (I know it's a do-it-yourself project but the smithy offered to do it for less than the tools would cost me). It will then be .35 Whelen.
So go out an get yourself a .35 Whelen. Then do your part to boost .35 Whelen ammo sales by purchasing .35 bullets and cases, or factory ammo. Then talk it up every chance you get.
Unfortunately it seems like the Whelen is offered in a $600+ gun. I think what helps popularize a caliber is what gun it's actually offered in first. Sometimes manufacturers can shoot themselves in the foot by making poor business decisions, or just not making the good decisions.
For example, Federal cartridge company offers a Whelen cartridge. That's fine. But they don't do a darn thing to market it.
The thing is, there's a lot of marketing potential with the Whelen. For instance it's namesake. Colonel Townsend Whelen is an interesting character. Anyone who heads into the Canadian Rockies for 9 months of "rest & relaxation" can have his name stamped on my barrel.
Most of today's trendy cartridges are designed for people who spend their time high up in some sky-scraper office. The Whelen was designed for a guy who spends 9 months eating what he shoots.