I think this is a sign that the estate agents are between a rock and a hard place at the moment.
If they say nothing about a slowing/falling market then they could see a standoff between sellers who feel that their house is worth a lot more than buyers are offering (or able to offer). This standoff could drag out over years with very little selling or buying going on and therefore very little profits being generated by estate agents during this period; they only get paid when the transaction completes after all.
If they alert the market to the fact that sellers are now reducing their asking prices ,then sellers might be willing to place their houses on the market at more resonable levels and some buyers might be willing to bite. The gamble with this move is that buyers could see it as a sign of a turning market and start to hold back and wait for more falls. This could cause a substantial correction in the market; but if you think about it, in the eyes of the estate agents, a quick correction would certainly be better than a long drawn out slowdown.
A ten year slump is the last thing the estate agents want and would pull many of them under altogether.
The next twelve months are going to be very interesting!