Well I was curious to see whether this enormous fan base for the Prequels and Clone Wars stuff really exists. Perhaps I am an old fossil.
So I went to theforce.net which most people seem to think is the definitive fan site, and looked at the forums:
11,000 topics in classic star wars
5,000 topics in prequels
2,000 topics in clone wars
OK, so clearly we must make allowance for the new stuff being newer. Nonetheless, I feel pretty confident in stating that the classic star wars are still more popular than the prequels and clone war things. (Another data point, box office for the clone wars movie was low).