I suppose it should be said of sports records that all of them could be broken, theoretically, at one time or another.
Some of them, though, are going to stand forever, largely because the sorts of conditions under which they were set no longer exist. The games have changed, and thus I think some Cubs franchise records will stand forever.
Here are five Cubs career marks and why I think no one will challenge them going forward. In general, I’ve limited this to post-1900 (and mainly post-Deadball Era) players because the game, and counting stats, were so different back in the day.