Don't get me wrong - I completely agree that you can't throw something away just because it won't be in perl 6 (since pretty much the whole perl5 language would be thrown away). However, I think that tphyahoo's comment was more based on the "seldom used" part of your comment: there are some "more advanced" areas of perl 5 which, if you aren't already comfortable with them, may not be worth the effort to learn at this point. I'm not sure that typeglobs are in that category, but, as a generality, I think the logic makes sense. Where that line is drawn may be different for each person, but that the line exists for some people I think is a reasonable statement.

Personally, I'm a complete geek, and won't stop abusing the crap out of perl 5 until perl 6 is somewhat established. But I can understand how that may not be true (or even should not be true) for some people.