I would see it as javascript's strict mode, and I think most devs would ok with a binary switch. The only fear I'd have is a lack of big entity committed to PH

I would see it as javascript's strict mode, and I think most devs would ok with a binary switch. The only fear I'd have is a lack of big entity committed to PHP. In the heydays there was Yahoo, facebook and other giant companies relying on PHP and guaranteeing that there would be enough man power to weather any type of changes. Now I wonder how many people are left to push through breaking changes and rewrite/modernize the libraries and the ecosystem.