The iPad should keep a majority hold on the tablet market for at least the next two years, iSuppli said in a new estimate today. Apple's slate should get 74.1 percent of the market in 2010 and is still predicted to hold on to a dominating 61.7 percent of the market by 2012. Such a lead would come even with the entire Windows tablet PC market in play as well as a wave of new challengers expected to hit in 2011.