Cracked chainstay's a little bit of an understatement. From those pics it looks to me more like a broken DO as others have pointed out.

11 years of ownership and (I assume) frequent (heavy?) use would lead me to think repair might be possible if time and resources permit.

Meanwhile you're without a bike? I'd start shopping around... maybe a local co-op, or even FB Marketplace, at minimum for a proper frame to fit you or maybe you'll find your next decade+ ride... if all or even most of the removable components are in decent shape.

Nothing lasts forever, even some memories. (Does REI still sell Novatas?)