Whenever I hear about the "wish list" about extending the R to Staten Island, my selfishness as a (retired) transit employee comes into play.
Can the crews imagine the scheduled running time of a train from Continental to possible Tottenville? First, southbound service reliability would be horrid by the time it got to the new tunnel, and the length of the line would mean only rookies would work it, unless you lived in Staten Island for traveling to work purposes. And they wouldn't get away with 1 round trip a day either. Definitely 2, as is the case now. And don't make me relay at CTL either!