Conclusion of Hack and HHVM
Php is a older language and it is very dear to lot of us but Hack and HHVM shows us better ways to improve our code and build features that do not currently exist on PHP, and give the performance PHP is yet to give.
The final option might be to run good old PHP on HHVM and still get good performance or learn Hack and use the new tools it presents. Either way the goal is to increase performance with less resources and give the user a better experience of the application.