[LAD] VST 2.4 v. 3.0

Hi everyone, does anyone have any idea on the uptake of VST 3 ? Is this becoming the standard and 2.* being quickly deprecated? Comparing the two, there is a lot of stuff in VST3, it seems quite heavy, which seems to be a change from the relative simplicity of 2.*. Also 3 does not look backwards compatible (so older plugins would not work with it). On the FOSS front then, with 3 we are stuck again with Steinberg's terms. So my question is: are developers in general sticking with 2.* or has everyone moved to 3. Again, my question has an educational slant, should we be teaching 3 or 2 (or both, if we are teaching VST at all, that is) ? Thanks Victor