Even if the school does not ultimately get accredited, if I am not mistaken your degree is still valid.
The only real difference between initial accreditation and a school that is already accredited is that the newer school just has more "check-ups" from the ADA as opposed to the accredited school. I think the difference is like 7 years vs. 2 years, but someone who knows the exact time do chime in. Or do a quick search through the ADA website and you will find it.