Perhaps part of the problem at this time is their are too many things hitting the limited resources of small plugin companies:
Move to 64 bit - this is proceeding at such a snail's pace.
Move to VST3 - it is an architectural improvement, however to most useful touted for for the average end user working in stereo is side chaing. Well I have been using side chaining for as along as their have been compressors and gates and other plugins that support it. Plugins with 4 input (main pair + key pair) channels are not new to VST3.
The other problem that I see with the whole VST3 thing is that Steinberg took a very long time after the Cubase 4 launch to release the VST3 SDK. Had they played 'nice' with the rest of the industry and released the VST3 SDK when C4 was released, or even put it out to beta long before then, then many other DAWs would be able to host VST3 plugins, which in turn would be a considerable incentive to plugin writers to support it. As it stands, I beleive only C4 supports VST3 - I dont know if the new version of Sonar does - probbaly not as historically Cakewalk have not suppported
VST at all directly (only via a wrapper) and only recently included native
VST suppport after DX plugins got pretty mmuch abandoned by Microsoft in the move to Vista.
I think their are guilty parties on all sides here - I think Steinberg were doing the right thing with VST3, just the way they went about it was perhaps a bit less than industry friendly and not entirely appropriate for a company in such a controlling position with respect to a technology that everyone else depends upon (Yes - I know its nice that they license it for free, but I am sure they gain far far more than they loose from that...). I dont buy into companies that winge about VST3, as someone said above - it was inevitable, but some winge about everything new and for some small outfits its a struggle just to keep up with the normal pace of change, never mind when a whole hep of technology and platform changes hit at aorund the same time - Apple OS and Platform changes impact this as well by diverting resources and atttention too.