I offered a solution (patents can only be acquired if you acquire the company that owns them). I'm sure there are others.

Then companies would just create a new holding company to own each patent that they apply for. All that does is add another layer of bureaucracy.

Not a problem as long as they are practicing entities. This is still the spirit of the law.

The point is that they could then sell those holding companies individually to trolls, so it changes nothing from the current situation. It's just that instead of selling the patent they sell the single-purpose holding company.