The end of the HIP has resulted in more people putting their property on the market according to Estate Agents. However it seems as though house-sellers, and perhaps Agents too, have not yet got to grips with the new EPC regulations that state that an EPC must be "commissioned" when you start to market a property. There are still nowhere near as many people buying EPCs as were buying HIPs.
Perhaps the reasons is that the EPC rules are less rigorous and, as such, are unlikely to be strictly enforced? I would also imagine that most people are just seeing what offers they get and won't order EPCs until they have too.