Would there be need for periodic DFT if we are able to get all the forcefields of all the elements in the periodic table in ReaxFF?
Quoting from the article The ReaxFF reactive force-field: development, applications and future directions

"Such empirical methods, including reactive force-field (ReaxFF),1 trade accuracy for lower computational expense, making it possible to reach simulation scales that are orders of magnitude beyond what is tractable for QM."

So yes, if you want accuracy, especially for something which the approximations made in generating a ReaxFF force field are not good, you are going to have to get out the Quantum Mechanics.