Nope, all we can do is take an educated guess. I know from what I see in the forum that the majority of people don't root their phones. And that would be the majority of members here. So you can only imagine how many phones are out there that don't even know a Droid Forum exists.
Now you might look around at the threads and say "What's he talking about," but when we have an over the air update members come out of the wood work. And they are not rooted.
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Over half the people I meet though out my day that have an android smartphone have no clue what I mean when I say "is it rooted?".
I heard Cyanogen has almost a million downloads I think if you count up all their builds. If that's the case then it might be bigger than we think. Especially because I think users in other countries are rooting since their carriers arent as krazi
Droid 4 fanboy
Well, supposedly only 0.5% of handsets are running Gingerbread. But that would be people flashing custom roms, so the rooted number is higher than that.
1-2% is my guess.