While James Mangold wasn’t ever interested in including the birthday feud, Sabretooth was included in early Logan drafts, where he was running a casino in Oklahoma City.
The last time Sabretooth appeared on the big screen was in X-Men Origins: Wolverine, which took place before the events of X-Men and fleshed out the relationship between Victor Creed and James Howlett (Wolverine’s original name).
While it would have been interesting to see the two brothers reunited after so many years, Logan was juggling enough material already, so we’ll just have to imagine how Victor spent the rest of his days after he’d abandoned his desire to kill Jimmy.