Tens of millions of pageviews per month on web apps I've been running for the last seven years built with PHP. I've invested heavily in PHP7 and am reaping the performance benefits of that.<p>Future projects will be built in PHP7, but I am learning more about using Golang in the long term.
Javascipt on frontend is there to stay, and either backend js frameworks will mature like meteor or there will be always dominant backend language like python, java, go or elixir.