++ you hit the nail on the head IMHO !!
Perl6's name implies that it is the next version after Perl5. Now such claim could safely be made if Perl6 largely builds on the syntax and architecture of its predecessor Perl5. However from what I have seen it appears that Perl6 is highly incompatible with Perl5, some very core constructs have changed semantics, all in all it simply is a different language.
Now I will not comment on the quality of Perl6. No doubt it has its merits given the development efforts and the experienced team of developers. It may well be a superior language to Perl5.
The real issue here is that by naming the new release Perl6 it degradates its predecessor Perl5 to an 'older now obsolete' release and it cuts off the natural path to an upwards-compatible 6.0 release. Now this may or may not be the intention of the Perl6 development community but it simply does not do justice to the Perl5 achievements, the installed base and happy Perl5 developers. It makes non-Perl programmers weary to start with Perl(5).
My plea would be to rename Perl6 to something else. Call it Perl++ or Perl# if you have it, just don't imply that it the next release that builds upon Perl5.
If Perl6 is the best thing since sliced bread then over time developers will jump on that bandwagon anyway.
Meanwhile let's not kill Perl5.