It sounds like this is exactly what Facebook plans on doing? > Therefore, we're committed to making it easy for most components and libraries built on top of R

It sounds like this is exactly what Facebook plans on doing? > Therefore, we're committed to making it easy for most components and libraries built on top of React to be compatible with two major versions at the same time. We will do this by introducing new APIs before completely removing the old ones, thereby avoiding those cliffs. As long as they provide deprecation warnings for APIs that will be removed in the next version, it'll work exactly like you say.