Yes so there are likely some software companies that might have issues (depending on what the changes looked like) such as Microsoft, Oracle, IBM (not sure if these companies would object or not, just citing companies with large portfolios). Some non-software companies like pharmaceuticals almost certainly would oppose changes that would affect their ability to exercise their patents.

Edit: A better example might be a company like Intel that has a lot of hardware patents. It is potentially difficult to change the patent laws to prohibit software patents without affecting hardware patents.