Freeview considering "mass retune" for HD

There are concerns from "broadcast industry insiders" that the introduction of High Definition services on Freeview in time for the 2010 World Cup will confuse viewers so much that it will reduce over 18million householders to incoherent, whimpering wrecks, according to reports. It is true that the 'early' introduction of HD channels (which will require several multiplexes to be reorganised and several channels to switch frequencies) means Freeview viewers will have to retune in order to continue receiving services, but surely it's better to get it all done in one go, rather than the region-by-region approach (in line with digital switchover)?