I don't mean to be overly critical of the guy who posted the poll, these come up periodically and almost always have those issues.
IMHO, tracking the overlapping between them would be an interesting data point - Python and C, Python and Javascript, Ruby and Javascript, etc. At that point you've got a cartesian product of everything to track (in this format), though. It would probably be best to do the polling completely differently.
Also: "which language + which niche" would be good. This seems to be skewed toward web programming.
IMHO, tracking the overlapping between them would be an interesting data point - Python and C, Python and Javascript, Ruby and Javascript, etc. At that point you've got a cartesian product of everything to track (in this format), though. It would probably be best to do the polling completely differently.
Also: "which language + which niche" would be good. This seems to be skewed toward web programming.