You can have hundreds of apps if there is no money in the pool to reward users, people will have no interest to use these apps.
If steem had already reached that critical mass level it would be a different story because big advertisers would probably help increase the price of steem but how do you go from 10 000 users to mainstream adoption with a constantly decreasing price? that's literally impossible and advertisers would never be interested in a niche forum.
How will SBD support the ecosystem?