Retconning Dead Reckoning Part One into just Dead Reckoning makes business sense to me. Not as many people saw the first part as expected, and those who didn't may not be interested in jumping in for a story they aren't up to date with. Final Reckoning still gives connective tissue but allows it to be sold as a final chapter style film that appeals to a broader audience. I think Dead Reckoning, while great, needed to be a bigger hit to create more positive momentum. It will be interesting to see if the required interest is there.