Non jokingly, Perl 6 will have wonderful support for a general sense of 'use stricter'.
In two words: type inferrence.
If you annotate your code with types, and further annotate subs as inferrable, and use a pragma for this saftey (sounds like a lot, but really isn't), then you get compile time errors for bad usage of data.
Other safety features Perl 6 has been designed with include:
- Better support for exception handling, especially with UNDO blocks, and 'let' variables
- use fatal;
- More complete lexical scopes
- more "serious" object oriented system - the opaque data type, better support for interfaces through roles
So in a sense, yes, it's time for 'use stricter' (optional, ofcourse), but at a level entirely orthogonal to (and an order of magnitude more significant and important than) style.