By the time common cheap hosting companies are adopting PHP 7, all relevant software, CMSes, frameworks, libraries will already have long since updated to new coding standards supported by PHP 7 anyway.
My point is, this is all “controversial” right this second, mainly because nobody anywhere actually has to adopt PHP 7. My prediction is, just like other versions of PHP, we won’t even see PHP 7 as the common version for like 5 more years, by which all common libraries will have already been updated.
Heck, I still use extremely popular hosts which still support PHP 5.4 or older. Wordpress can still run on 5.2 though they recommend 5.4. By the time 7 becomes a requirement and is common, we’ll already be talking about the controversies in PHP 11.