Ivory ferrules have been used on cues for at least 60+ years. I have a 1974 JOSS cue with ivory ferrules and an ivory joint. When I had Danny Janes make the cue, I asked him about breaking 9-ball with it. Back then, most players broke with their playing cue. He told me that if I brought it into the pool room, took it out of the case, and let it come to room temp, that he would replace the joint or any ferrule for free! I've done this for almost 40 yrs and still have the orginal joint and all orginal ferrules on all 9 shafts for the cue. I even broke bar table 9-ball with it sometimes ( with the heavy oversized cue ball ). Some people back then put fiber rings between the ferrule and the tip. A lot of us used ' champion leather tips ' that come with a fiber backing on the tip. For the last 20 yrs, I've used triangle tips with no backing and have had no problems with any ivory ( I have the JOSS cue, a Bob Frey custom cue with all ivory, and a titliest conversion with ivory ferrules ).
As someone said, keep the tip size good. Better to change a tip than an ivory ferrule these days.