I never heard that they were being relocated to Sidari but there was a lot of discussion last year the Club 18-30's were pulling out of Kavos. How true that is I don't know. :o)
Its definately not happening this year and can't see it happening full stop. The reason they were put in Kavos anyway was so they could be away from everywhere and everyone else!
Happened in crete a few years ago though and they moved them from ag nik to the beautiful Malia so you never know!
We booked our holiday on Fri to Kefalonia again and told our travel agent about the bad holiday we had last year in Sidari, his comment were if we had booked through him he would not have advised us to there and commented on Sidari becoming an 18 - 30 place in the near future, whether that was his own opinion, or anything he's heard through the travel business I'm not sure
We went to corfu last year we went to sidari for the day and in my opinion it couldnt get any younger of more lively dont get me wrong i didnt particularly dislike it but i wouldnt stay there with children even before it went 18-30 just my opinion nice beach and plenty to do dont let me put you off