Landing in the TDZ does not mean anything in itself.
If you have a 2000 meter rwy and you land in the last bit of the TDZ, you only have 1100 meters left.
The manufacturer's FCOM data on actual landing distance assumes you land 300 meters after the threshold. So before the blocks. Go figure...
Too many variables to give a definite answer.
Go around is always a safe option when in doubt.