Nothing. Because I already use c++, objective c (which has some good ideas too), and python, and this doesn't seem to have any killer feature worth the learning cost.
Well, perhaps if the python GIL is causing pain I would look at GO more closely.. in which case it also would be compared against Java and C++.
As far as "channels", I do that already with pipes and multiple processes and get fault isolation to boot. As far as 'fast compile speed', that's because you're not inlining anywhere near what c++ does.