Terminating after reaching one would be mathematically inaccurate to the original conjecture. While the information after reaching one would be repeated, the 4, 2, 1 loop is the only reason that it terminates there. If it could continue past this loop then the conjecture wouldn't end at one.

Terminating after reaching one would be mathematically inaccurate to the original conjecture. While the information after reaching one would be repeated, the 4, 2, 1 loop is the only reason that it terminates there. If it could continue past this loop then the conjecture wouldn't end at one.