DSA may not have been a good choice as a MUST algorithm.
Schnorr makes a plausible argument that DSA is covered by his patent
(see http://grouper.ieee.org/groups/1363/letters/SchnorrMar98.html),
and his European and Japanese patent claims are broader than the US
one. That probably means that there is no restriction to hardware
implementations in these patents.
RSA is patented only in the US and will expire in two years. Schnorr
is patented in US, Europe and Japan for a decade to come. Not very
nice.