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Patents are provided for in the Constitution. Removing patent protection would take a Constitutional amendment.

You are wrong:

U.S. Constitution
Article I - Legislative Department

Section 8.
The Congress shall have Power To ...
(Clause 8) To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries;

The congress has the power to provide patents but doesn't have the obligation to do so. If the congress were you, the congress would have the power to bear arms but absolutely no obligation to do so. (It's a very interesting fact that the constitution speaks only about individuals - "authors and inventors" not about corporations or reselling the exclusive right - but it's another topic)

I agree with you that there should be incentives for the authors. That's why, I'm arguing only about limiting the patent rights of expatriate producers. Very easy - limit their term to 3 years, limit the damages they can claim to 50% of the infringing product's profits, etc, etc. The possibilities for improvement are countless. They fit nicely in the spirit of tort reform.