Starting next year, Google will provide Chromebook security patches and software upgrades for up to a decade. This will effectively guarantee that no existing Chromebook will expire within the next two years.
However, a Google spokesperson added the caveat that, "In making changes to the expiration policy, we have to coordinate with each partner making any component in these devices. It requires a security and performance guarantee from the makers." Other Google sources indicated that the major Chromebook vendors are expected to work with the company to extend their hardware's lifespan.
I read the article. It is still unclear to me if the king of this e-waste, the Acer c720 will get any new updates. They started making it in 2013....but it was made for a while. There are soooo many of these things that cannot really run chrome anymore because of one reason or another.