1. The government could conduct searches and seizures at will of corporate property in disregard of the Fourth Amendment.
2. It could take corporate property without compensation in disregard of the Fifth.
3. It could deny the rights of free speech to the New York Times and other corporate entities in disregard of the First.
4. It could deny the right of religious expression to churches, synagogues and other religious organizations that are incorporated.
Nor, if the logic of this piece were to be followed that "state-created entities" should not be protected under the Bill of Rights, would any other legally-recognized entity be entitled to such protections.
How about:
1. Universities.
2. Schools.
3. Charities.
4. Partnerships, LLCs, trusts, and other business entities (want the government to confiscate the IP or other assets of your startup and say it owes you nothing because it is not you but a mere "state-created entity" from which it is taking the property?).
This list could go on and on at great length.
The analysis in this piece may be something that one may want to advocate as some sort of ideal but, in terms of law, history, etc., it is quite flawed. I think this is more a talking point in the recent uproar over the Citizens United case than it is a serious point of constitutional discussion.