One Perlish issue (that frag brought up) in respect to Perl5 method call syntax is that an arrow has the semantic meaning of action. In the case of $foo->bar;, $foo is performing the action bar. I think that using the dot for method calls will lead to a less semanticly meaningful model.

Of course, with this issue, there comes the question of how valuable or important is it to have similar constructs across different languages? Does it add or detract from a given language?