I think this is the real worry for this project. A year ago side chains sounded like an amazing new feature and it will be the best platform in the world. However, NEO is going strong and ADA who like LISK has not released a usable project, is also going strong. Competition is heating up and LISK is still in the same place as they were this time last year.
Neither NEO or LiSK will surpass the development done by ETH in coming 10 years. LISK is just saturating around the coups maintained by delegates.
Delegation is the main disadvantage for lisk.