I have a PHP/Symfony project boilerplate that I use for all of my projects and I added static site generating to that boilerplate. That allows me to make a static site and then easily switch from static to dynamic if I need to. The only thing I need to change to make the switch is my CI configuration. It has already come in handy on a couple of projects and it doesn't require any special maintenance since I'm just storing the output of my dynamic app.