Under 50 companies took part in this year's three-day congress and delegate numbers were down by about 400 to fewer than 1,000.
Many of the show's regular exhibitors stayed away this year. But United Business Media (UBM), which took over the show in April, said it is sure companies will come back for the London event in 2010.
Conference organiser Michael Oakes said: "We are confident that exhibitors are going to come back. This year people were cautious because the event didn't run last year but the feedback was good."
UBM is planning to broaden the scope of next year's congress, which will be held at London's ExCeL centre on 1-3 November.