Also, there is a case of diminishing risks as the number of blocks grows and the number of nodes continues to grow. Relative to the existing coins, new coins represent a smaller percentage of the monetary base with passing time. Even though the risks of catching a bad coin created since a split increases with time as well, they are relatively remote, and tend towards zero over the next 120 years. But the risks also tend toward zero at a log, not in a linear progression.
What I’m saying here is, by the time that bitcoins catch on, the risks of trading with bad coins during a network outage drop as the popularity of the bitcoin increases and also decrease simply as the blockchain grows over time.