The model is here to stay however what makes a serious concern right now is the participation levels. The number of active users are way too low when compared to registrations.
One thing we can do is reach out to those new posts and introduce yourself tags and motivate new ones here.
Most of the signup numbers are bots and mined accounts from the early days. Bots and name squatting are likely to be in the hundreds of thousands unfortunately.
No way to control them? I realized I crossed a 400 follower mark but it was disappointing to see 60% of them not active for more than 21 days.