One of the advantages of nursing as a career is that it offers so many disparate paths and options. If you (the OP), as someone focused on getting into CRNA school, don't see any value for yourself, personally, in getting a BSN, that's fine. I only completed a BSN years ago so that I could apply to graduate school (I am an old diploma graduate, and received a much better nursing education in my hospital-based diploma program (admittedly, a very good diploma program, which not all of them were) than I did in the BSN completion program I attended, or the ADN and BSN programs I've taught in since then).
However, neither your personal experience nor mine can be generalized to the entire nursing population. The vast majority of nurses never attend graduate school; for many diploma and ADN graduates, completing a BSN expands their professional options/choices in ways that are valuable and meaningful to them. There are many reasons why individuals choose to enter nursing through a university-based BSN program rather than an Associate's degree program (please note that I'm not saying one (either) is better than the other -- just that different people have many different reasons for choosing one or the other. Please, God, let's not start another ADN-vs.-BSN debate!!). Many nurses (I've known some personally) choose to return to school and complete a BSN not because it will necessarily make a measurable difference in their careers, but just for the personal satisfaction of earning a baccalaureate degree.
Not only do I not feel that the BSN is "obsolete," I believe it will continue to grow in significance as nursing (and healthcare in general) continues to grow more high-tech, complicated, and demanding. If any nursing degree is going to become "obsolete," I would expect it to eventually be the ADN. I have v. serious concerns about how current BSN programs are organized and implemented, but that can be changed -- IMHO (and experience), we are getting closer and closer to the point where it's just not going to be feasible anymore to provide basic nursing preparation within the scope/limits of an Associate's degree.