Looks interesting! I'm all in for writing secure code. Sadly, Zend said that they don't want PHP to change a lot because of backwards compatibility, and that's why we are still stuck with different bad ideas that appeared in its first versions...
PHP 7 will help to speed up Wordpress sites twice, but it doesn't help with code itself anyhow. I haven't looked at it for a long time, but back then its code was pretty bad. Drupal 8 built on top of Symfony 2 components is terrifying, as PHP's main selling point (and Drupal specifically) alwasy was simplicity.
PHP is just another tool. If we're talking about backend, then its perfomance is good enough for small to middle sized applications. PHP borrowed a lot of language features from other languages in the last decade, it's a different language now, still there is a lot of old poor written code.
PHP 7 is great for those who are already used PHP for years, cause it uses half of CPU resources doing the same tasks as PHP 5.6. I don't think there is any good reason switching from Golang for example if you are aiming for writing scalable applications; still, every experienced PHP dev I know are still getting their things done and doesn't consider switching.