Looking back, it seems to have become even tougher to win a back to back Olympic gold medal. There are only a handful of skaters to have accomplished that, and most of them are from the distant past.
Sonie Henie (did it twice!- three in a row)
Rodnina-Zaisev (76 & 80)
Irina Rodnina- did it 3 times in a row (72,76,80)
Dick Button 47 & 48 (or was it 48 & 49?)
Belousova-Protopopov (64 & 68)
Katarina Witt (1984 & 1988)
Grishchuck & Platov (1994 & 1998)
No one has done it since.
A few skaters came close, but did not quite make it.
Valova-Vassiliev: Gold 84, silver 88
Mishketenok-Dmitriev: Gold 92, silver 94
Plushenko:Gold 2006, silver 2010
Plushenko was so close (less than 2 points overall) to winning the OGM again in 2010!
Had Gordeeva-Grinkov decided to compete in 1992, they would have likely won the OGM, but from Katia's book it seems Sergei did not want to compete after 1990.
M&D probably should have won the gold in 1994, but the judges said no.
Viktor Petrenko had a great opportunity in 1994, since both Boitano and Browning made major errors in their SP. Viktor had only a turnout on his 3A combination. Had he landed the 3Z cleanly, he would have been in the final group, with a chance to win the OGM again. Artistically he was superior to the younger guys and none of them landed a quad. Of course a similar argument could be made in favor of both Boitano and Browning.