Of course one can have any extension. Not that it's a bad thing to use .p6. I was just trying to make it clear for myself to understand how beneficial the new extension is. Part of that lies in "marketing" the language. Old school engineers may still want to use .pl, whereas newbies will follow the documentation and have their files prefixed with .p6. My worry is that such behavior may lead to a confusion in Open Source world and push away newcomers from using the language.

I've been following the journey for, more or less, the past 10 years. I hope that whoever spent those 15 years on developing Perl 6, will reap the rewards.