Having done a bit of digging, I think the figures Nicolas is touting for Android 2.2+ uptake are a bit optimistic.
A lot depends on the sort of players your games attract, of course. I just went through the stuff I've done (that I have a decent amount of stats for) and the % of players who are on 2.1 or earlier isn't 11% or anything like that.
It varies between 22% (double Nicolas' number) and a little over 30%!! That's a BIG chunk of players I'd be cutting-off by moving to GLES2 (or developing from scratch using it) - is that entirely wise?? (I think not)
I realise those on older versions can keep playing the older versions of existing games, but by moving support and new development to GLES2, you're cutting-off a lot of customers.
Yes, most people have an update route to 2.2 at least - but clearly a lot of people aren't bothering. I don't really have enough data to see if the 2.2+ percentage is growing at a significant rate but I imagine it's certainly growing.
A big issue with the numbers are, of course, tablets - those which run 3.0 are obviously distorting the data upwards. I tend to ignore tablets - mainly as I think most current Android tablets are overpriced junk - and that perhaps explains why I have a higher % of 2.1 or earlier customers.
I thought it was worth pointing-out anyway - it's a busy marketplace already - you'd be foolish to turn-away too many potential customers??

