According news only one times part of the tokens was burned. But thanks mining and leasing the quality of the tokens are constantly increase.
If demand is satisfied, then burning will not be necessary. It is necessary to expand the project. It seems unreasonable to program a large emission first and then burn the coins. It is also expensive for the project.
I agree that it is necessary to expand the platform worldwide and to create new products on platform, that tokens will be in demand.