I don't know. Seems the complexity of solo content would be pretty straightforward. And let's be honest... when public events such as Escalation Protocol and Blind Well lose their popularity (very quickly after people get the rewards they want) they become solo events - are they are abandoned. I would also suggest Daily Missions or Strikes could be easily tweaked to make solo options with modified loot pools and difficulty. The most likely thing to cause difficulty is restructuring the GUI to accommodate the new menu items. In reality that's creating new categories much like they do during special events. And, once it's done, it's done. New items in the menu category could be easily added.