What proportion of the professional philosophical community still
believe that philosophy's task is to clarify language?

This is obviously no "answer".
What proportion of the professional philosophical community EVER
believed that philosophy's task is to clarify language?

I don't know about proportion, but I imagine a fair number are still
working in the tradition of analytic philosphy/logical positivism
(Wikipedia is quite useful).

I thought logical positivism (linguistic analysis) was pretty dead. 
Isn't it?  (I still like A.J. Ayer, but I mix his ideas liberally with
others that he would never have countenanced.  That's the advantage of
being a consumer rather than a purveyor of philosophical systems.)

Archae0pteryx

I think so too, but I just wanted to know if there was any data that
could corroborate that answer. Anyway, I doubt so since no one other
than philosophers (and sometimes not even) seems to care about
philosopher's lives and positions.