Well right now there are not that many alternative languages regarding flexibily
How about Python, Ruby, Groovy, Scheme, Lisp, Smalltalk, etc. :-)
Whats your opinion regarding perl and parrot?
I think Perl 6 will be finished. There are enough talented people with the enthusiasm to see it through. Parrot is nearly at the level to implement everything, and the language design seems to be pretty much as far as it can get without having an implementation to play with.
Whether it'll be a success or not I don't know. These things are so hard to predict and depend on many things that have nothing to do with the technical merits of the language.
Personally, I think that the thing that will determine Perl's success is how well Parrot succeeds. It's coming in late to the battle between the JVM and the CLR and, to a lesser extent, the various Smalltalk/Lisp VMs. With implementations like Jython and IronPython proving that you can implement dynamic languages reasonably on the JVM/CLR that's going to be a tough fight to win - whatever the technical merits.