I think John Marshall has improved over the last 10 years. Somewhere I read an article on that, but its an independent for profit school right? So literally whoever owns the school will make a difference, if they are dedicated to the school then it will work continue to improve, if not, then the school will decline. I think there are is more stability at public and private schools that are non-profit (the vast majority of law schools). I know John Marshall is partially accredited, which means you could sit for the bar, end of question.
Hmm, I had never heard of Jones before, but I just checked out the website it too is provisionally accredited meaning you could sit for the bar no questions asked. Its LSAT numbers were slightly higher 147-152 then I anticipated-it doesn't seem like a bad school, it just won't open any doors for you career wise.
Really you are not in that bad of a position, you got into two ABA approved (even if not yet fully) and one is offering decent money. I think it doesn't hurt to wait another year and try again because you can probably get into these schools again and you if they asked you could say you wanted to complete your masters first. On the other hand, you would have to go into either one of these realizing, that you are there mostly for the degree, a few top students might get excellent jobs, but those will be few and far between, your goal should be to learn as many practical skills as possible that will make you marketable in the long run. Probably means doing any clinics the school has or working dirt cheap at a law firm to gain experience.
I think you probably made the right choice.