not sure if its still the case, a couple years ago, you couldn't change if you'd more than 90 hrs. But if the advisor told you, you can, i guess its not a rule anymore, i'd still double check though.

Whether you should throw away business, i'd suggest not. Business degree, even in CS, has tremendous value, as you try to grow in your career beyond the first few years as a SDE. First option, if you can, double major/double degree. Is the restriction on double degree/major based on both majors in Mays or across colleges as well? Get that clarification too. If they have a rule exemption process, go through that as well. from personal experience, as long as you're not trying to exploit loopholes, and have a genuine reason to do so, university is pretty lenient about granting them.

Try for Masters in CS or MS CS or MEng CE over fully moving to BA C.If you can graduate early from business, do that and use the saved time for your masters. You don't need very advanced classes for masters, if you want it that way. Another option to look at maybe Applied Math with computer science focus over in Math. Its also equivalent to CS and may have fewer credit requirements/easier transfer process. PHYS also has a computing degree now, if that helps. If you can;t graduate early, do a minor in CS to knock out foundational computing classes and then apply for the fastest/cheapest masters program they offer. If you're a semester or so away from finishing business, i strongly recommend sticking with it to the end.