...ends it finally? When i buy token what happens at the end of development?
The end of development or the end of the sale? At the end of the sale the coins will be distributed, perhaps after some level of KYC. Once the coins are distributed you're free to do with them what you wish. Most coins are continuing development after the sale, in fact they use the sale to raise funds in order to continue development. It is my belief that a project should never end their development and should always be looking for ways to continue to improve.