Covid was also initially stated to not be a concern because human to human transmission wasn’t thought to be possible, then it didn’t have aerosol transmission, then it became inevitable that basically everyone would get infected.

I think it’ll take a couple weeks until we know whether this is an evolution that has airborne transmission or it’s just being spread through physical contact (and it fortunately seems to just be the latter). Until then it’s some researchers saying it won’t spread beyond a few cases and some people saying it’s the next plague.