Keep in mind that the changes since 1.0 have been with very few exceptions completely backward compatible. I write a significant amount of Rust and I don't follow the development of the language ultra closely anymore, yet it doesn't feel like I'm coding for a moving target.

Basically from my point of view the changes are about adding features (inline ASM in this case, async I/O previously) but it doesn't really change the way you code, it's just an other tool in your belt that you may decide to use later. If you didn't have a need for inline ASM before you still won't be using it, if you couldn't use Rust previously because of bad ASM support it opens up new use cases.

As long as it's backwards compatible, why should that be a problem?