It requires a great deal of time and resources to develop blockchain software because everything has to be built up front. Doing an upgrade is not easy because nodes can choose not to upgrade and fork instead. Also, bugs mean people lose money and consequently faith in the project.

Tezos intends to solve the contentious fork problem by incorporating the governing structure into the protocol. Whether this works better than what is currently happening in the Bitcoin community remains to be seen.

Back to your initial question. Ethereum is a good example, but most of the ICO's that raised money recently won't launch until 2018-2019 at the earliest. In fact, some of them have innovation gaps. It's a long road.