Given the fact that there are over 7000 VST2 plugins available out there, it is very unlikely that any DAW will stop support for them anytime in the near future.
I understand that Steinberg wants to promote and encourage VST3, but removing VST2 entirely is not the right way to do it. As I suggested, they should just release it open source with no support for it.
I am using VST3 SDK because I think it is better APIs than VST2 and it comes with a GUI environment but it is not reasonable to imagine that those 7000+ plugins will be “ported” to VST3 since it is not a trivial task
Yan