Perl 5. In what way do you think it won't continue to solve any needs just as it did before. It's obvious someone will support it, and it's not like "this will rob Perl 5 of new people and feature development" has been valid for a decade (there isn't much in the way of new feature development, it's all strangled by backwards compatibility), and it isn't drawing new people.
For the hundreds of thousands of lines of Perl 5 code at work, I expect we'll still be running Perl 5 a decade from now, and it will still be supported in maint mode by someone, if not the official Perl devs (but probably them, I suspect some will be fine just doing big fixes for the old code base).
For any new Perl project/environment, I'll just use Perl 7.
For the hundreds of thousands of lines of Perl 5 code at work, I expect we'll still be running Perl 5 a decade from now, and it will still be supported in maint mode by someone, if not the official Perl devs (but probably them, I suspect some will be fine just doing big fixes for the old code base).
For any new Perl project/environment, I'll just use Perl 7.