Only half kidding [above].
This backward compatibility idea has its merits and is largely its commendable, but everything and everyone, at some point in time, has to move forward, or they hold everyone else back.
What would perhaps be more useful, right now, than a discussion about whether we draw a line with PHP 7.0, is a discussion about the principles behind coming to [technical debt, type] decisions like this, what motivates the arguments, and how the decision, when eventually arrived at, should be made.
That discussion should also include ideas on what thought is given to–what is actually done for, and the opportunities left to–those the decision leaves behind.
Otherwise it just becomes a free-for-all question of who shouts the loudest, or who has the most compelling use-case, or perhaps who has the cabal’s ear, which I thought was the primary reason we are all here in the first place.
A bit like democracy. Mob rule by another name.
~ posted by Terence