mamba
Legend
they can be certain that the new ones are better and be certain that a not insignificant percentage of the player base will not switch regardless.They've sworn up and down that you can keep using it. If they had faith in their designs and weren't so convinced people would stop buying their products, the new books would actually replace the old ones, if they really thought they were better.
It has always been up to the players to decide whether they are replacing an old edition with a new one, or stick to the old edition. WotC is simply acknowledging this now and making sure that those staying with the old version are not abandoned.
other than the name, that is what we getnew book full of new classes that do the same thing with the other PH material, and release it as a new starting point for 5e that you can use as an alternative to the PH.
Something like a "5e Essentials".