Together with clause 1.6:Any and all prior Agreements between Steinberg and the Licensee shall be automatically terminated by signing this Agreement.
So, what this means is that any developer intending to use this last SDK will terminate their previous Licensing agreements and by doing so they can no longer use VSt2 SDK or Publish updates to it, developers wont be able to include VST2 in their installers and host won't be able to use the format either.This Agreement neither applies to the development nor the hosting of VST2 Plug-Ins.
Developers don't have to jump into the new agreement just yet but time is running out. Other problem for many plugin developers is that even if they now have VST3 versions there might be using some parts of the VST2 SDK.
DAWs are going to eventually have to drop VST2 support and I am sure users are going to be pissed, hope this situation helps push the adoption of CLAP.