[sago]

Rewriting your language, like any other piece of software, is a great way to lose your market position: http://www.joelonsoftware.com/articles/fog0000000069.html

[pjmlp]

People forget that if one is forced to re-write the code, it might as well just use another language.

[ufmace]

I mostly agree with Joel there. It's worth pointing out that if doing a from-scratch rewrite of your end-user app is a bad idea, then doing a from-scratch rewrite of your platform that will force all of your users to do from-scratch rewrites of their apps must be orders of magnitude worse.

[kamaal]

Its a damned if you do, damned if you don't situation.

You have to evolve to survive. If you don't don't you may stay alive for a while. But you will die slowly.