I don't believe that the Massoth DRC300 was too complicated. I think the main failure was the inappropriate choice of radio system. DCC by wireless has been done, mainly in America, but again using radio systems that are either illegal to use in the UK or are prone to interference problems. One manufacturer admitted to me in reply to a question that it would be impossible for two users to operate their system in close proximity. I fail to see why no manufacturers have come up with a DCC system using 2.4GHz DSM radio. This format has proved itself to be solid, reliable and free from interference, and can be used in most countries. For the present I, and most of my friends use Spektrum, Orange or Deltang radio with simple ESC speed controllers. The problem here is the lack of DCC quality sound systems, particularly with UK sounds. If anyone still thinks that digital control via wireless is difficult to achieve, then they should have a look at the Railpro system currently available from Ring Engineering. This is not a DCC standard system, but it seems to achieve the same results, and some would say better results.
I have spent many months looking for a DCC system for battery power in the large scale garden railway environment, but I have found nothing to come close. The DCC manufacturers seem to have their heads buried firmly in track based solutions. This is presumably the reason that we are starting to see a proliferation of non-DCC solutions from Ring Engineering, Bachman/Bluerail and Protocab etc.
David