Why are corporations permanent entities?

Ive been thinking about the whole regulation deregulation thing. I’ve come to the conclusion that yes, we need regulations. But we need regulations due to the fact that corporations number one objective, is profit. This could lead to unethical operation and greed of corporations and stockholders.

After hearing Biden say in the debate, that 95% of small businesses make under $250,000 a year, that says to me that besides wealthy individuals, only 5% of the serious wealth is in small businesses and the rest is in corporations.

When this country was founded, corporations were given limited charters and had to benefit the public. For instance, when a railroad was going to be built, the charter was given until the project was complete and then the corporation was eliminated. It also benefited the public. Now corporations are given free reign and can also move overseas, bypassing our labor laws and environmental laws.

Wouldn’t it make more sense to abolish permanent corporations and go back to the original intent of corporations? In my eyes, it would be allow us to shrink the size of government and allow the free market to operate as it should. If we relocalized industries, the public would be able to hold businesses accountable for their actions.

When John McCain says that we have the best workers in the world, it makes me wonder how long it will be before we are all working for the same handful of corporations. I believe we need to move back to small businesses taking charge of what happens in our country, not trying to compete with corporations who go overseas where people have little rights.

Why are corporations permanent and should we go back to be a small business oriented country??
Why or why not?