ETN is not releasing any coins at all. This is not the XRP model where they have all the coins stashed in a back room and releases a bundle on a schedule.
The coins are mined and the emissions are high early in the coin’s life by design, just like any other minable coin. It is not something that can be adjusted without a hard fork and a lot of hassel. That simply won’t happen, although it is always possible. They are busy doing actual business deals and implementations which will make it all worth it in the long run. When the demand comes in, the emissions will not be a problem. The emissions slows down with every block…so it will not be like this for long. There will come a day when people are complaining how expensive the coins are when thwre are millions of people using them.