Like Chrome, GCF is on the 6 week release cycle, so expect features like per-user install and even faster starts that are arriving in the Dev Channel to become available quickly.
So what are you waiting for? Say no to legacy baggage and start saying yes to HTML5 and the future by adding the GCF header/tag to your sites and apps. It's nearly zero effort. When you're comfortable, you can add a prompt and free yourself to build sites and apps against only the modern web. When you do, you'll see how fast and productive web development can really be. I promise you won't want to go back. Thanks to GCF, you won't have to.