There are a couple of important issues about token economy.
1. It’s not possible to block DDOS attack while making micropayment possible.
2. It’s not possible to canceling or editing existing transactions while preventing double payment.
People in this field already have been recognizing this paradox : If you choose to make micropayment possible, you would be exposed to DDOS attack because the transaction fee is close to $0.
I agree that this issue is not solved easily. To activate coin ecosystem, however, those issues should be solved. In other words, a new coin system which can solve them will take all hegemony in the future.
The picture below is a concept draft of the main net that is designed to solve the paradox. It is hard to organize things that I thought for over a month.
You may think that it looks like Tangle. This chain system, however, has been developed based on Spink algorithm from 2007. Spink algorithm is a kind of simplified block chain.
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And this one is the solution of the Spink puzzle I mentioned on the previous post.