Very excellent point, PHP 7.0 does indeed EOL around the same time as 5.6. Though, if an org is able to make the move from 5.6 to 7.0, the move up to 7.1+ is trivial as no backwards breaking changes have been introduced.
Just like it was a struggle to get people away from Windows XP and the mysql_ext; I fear it will take something drastic to get organizations to realize the 5.x linage is now becoming a risk instead of an asset.
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