I think DRM stands a chance, only because it's a fairly open standard. There is enthusiasm in Europe, but it is slow going.
IBOC, on the other hand, is toast and on life support. The only hope for it is for the Ibiquity lobbyists to get the FCC to cram it down our throats, and it looks like it may happen. There are semi-serious discussions happening now around moving all digital AM stations up to a part of the spectrum vacated by VHF TV stations when they shut off their analog transmitters in February.
Ibiquity and the larger broadcast conglomerates would probably rally around this idea. It would force, en-masse, consumers to abandon most receivers for new gear and probably be the nail in the coffin for smaller ma & pa AM holdouts. It would be a sad day for American radio but it would actually open up interesting possibilities for mediumwave DXers, as the MW spectrum in North America would suddenly become quiet. The DX would be rolling in. It's a high price to pay, though.
Here is an article on the concept:
http://www.rwonline.com/pages/s.0052/t.15575.html