Wizz currently carry around 300,000 passengers to/from DSA then it would suggest there is some 'real' growth to come.
Since Wizz started operations at DSA in 2006, they've carried 1.2 million passengers. By the sounds of the articles it seems that we may have more flights for the routes we have currently, and the possibility of new routes. (That's if they do go ahead to try and aim for 1.3 million passengers over the next couple of years.)