The Agreement has nothing to do with Greg , Blockstream , or the rest of core devs that didn't participate. Luke has promised to deliver the code to fulfill the agreement by July, whether the miners and the community decide to use it or not is unknown. The earliest a HF will occur will be in July 2017 if the miners stick to the agreement so don't expect anything soon.

Your question is odd because it assumes that Greg is running the show or even has commit access. He gave that up a long time ago. A question that would make sense in this context is asking each individual core devs their opinion.