Comment by antirez

The problem with all that, is the fact it remains possible to create a protocol with N big institutions (governments and large tech companies, big non profit organizations and so forth) signing every block, to create a collaborative system that is perfectly suited for the same task. The system can make progresses as long a given fractions of the participants is available and so forth, there are a number of well known protocols to do so. This maintains many benefits of the blockchain and lacks many issues (fast, simple, near zero cost, controllable to a given extent -- no takeover possible, ...).