PHP7 has better chances of being adopted faster than previous PHP versions.
The advantage of speed is always welcome and besides now it's easier than ever to run multiple versions of PHP at once. PHP Incompatibility of applications created on earlier versions was the main problem with earlier migrations in PHP.
Vesides, PHP7 does not bring such a learning curve as PHP 5.2 or PHP 4.
In my opinion, I feel very optimistic on a faster migration to PHP7.