It's all about the term of copyright versus the term of patent. Patent lasts only twenty years at present, while copyright is effectively perpetual (whenever Pooh and Mickey might enter the public domain, the legislators fix it). If copyright governs interfaces, that part of the law will keep the government from stealing IP away from its rightful owners after twenty years.
Is it time to produce a new language that is not like Java syntax. Surely some variant of python or APL could do the job. APL was used in the 1980's and cloaked in a modern garb could replace Python and Java both.