Perhaps the biggest concern right now is vendor buy-in from other browser vendors such as Microsoft and Apple. It appears that React, at least for the time bein

Perhaps the biggest concern right now is vendor buy-in from other browser vendors such as Microsoft and Apple. It appears that React, at least for the time being, is a more immediate and practical approach to composing UIs. I'll still be mixing Polymer into internal/side projects to keep up to date on its status, but I don't think I'll be pushing anything public facing for the foreseeable future.