I have no idea.
Unlike apparently the vast majority of people here, I love the existing Wizards site and have great confidence in the team that will likely be working on Dragon and Dungeon, and, having done web design in the past, I know that at least 90% of the 'difficulty' is smoke and mirrors to raise the profit margins of web design companies. So, I have every confidence the service will be up and running, and will be of exceptional quality.
Nonetheless, predicting the state of anything in the RPG industry five years out would be foolish.