Don't get me wrong, I'm under no disillusions that meph will be banned tomorrow and by the weekend we'll be able to buy 100 half decent pills for 100 quid like it's 2007 all over again; it'll certainly take time but I think the situation will improve as a result of banning meph.
It's all about supply and demand. The availability of good pills in The Netherlands and the fact that MDMA has returned in small quantities here shows there are people out there with the capability and inclination to make it. However, as long as meph is available cheaply and legally there will be very little demand for it.
I think given a choice between MDMA and meph, both illegal, similarly priced and of uncertain quality, people will go for MDMA all day long. Right now that's not the case, so the lower demand is reducing the supply.