They will be replaced with weapons similar to the console exclusive items I've had Terraria for over 3 years on Xbox 360 and now on Xbox one, and I really never got attached to theses items in the first place because they weren't from PC. They where never meant for the game in the first place and where more of an afterthought among the dezs.
here's the thing, some players and aparently the devs don't like this items but these items are included in the game itself, they came with the game and were shown even in the original trailers of the game, so I think the best way to go about this is to fix them up instead of removing them. they were promised and were a selling point for a lot of players who already owned the game on PC or for players to not abandon the game. I hope that my viewpoint makes sense here and that these items can be re worked back in