Disclosure: I am the author of that post and Product Manager for this project as well as other related work like Certificate Transparency and Key Transparency.

While I can not say what Google will do in the future, I can say we are very supportive of Let's Encrypt. We have provided them funding and I personally act as an advisor to Let's Encrypt.

In short, we love what Let's Encrypt is doing.

They might, and then abandon the project a year later, like many other Google products.