It's game over for Snapchat. Instagram has already duplicated the disappearing photo/video features of Snapchat in the current version (amongst other features), so it's lights out for Snap unfortunately. They should have taken the $2billion offer from Facebook years ago. By Snap's founders basically giving Facebook the middle finger on the buyout offer, all they did was give Facebook engineers plenty of time to duplicate everything on their own in Instagram.
Keep in mind the founder owns about 13% of the company so even if it fails he is cashing in on more than 2Billion right now, of course depends on how much of shares he maintains could change that

or at least a pullback.