Some of the copy/paste spammers have already beaten this method in that they replace certain words, replace letters with symbols, among other things.
Some of these spammers also will copy content from sources not on bitcointalk.
There are actually tools to spin text and make it completely unique. It has been in existence for years, those tools are used by webmaster to create web 2 or content for pbn links. Anyone with little bit knowledge of Internet marketing would be aware of these tools already.