This idea was doomed from the start. Tama nga naman, remove half the cars and speed would increase to 40kph. But MMDA was probably thinking of an ideal world where the odd-plated vehicles would magically disappear once their window ends, and vice versa for the even plates.

Anyway, now MMDA is floating the idea of congestion pricing... ala Singapore CBD.
MMDA: How about an Edsa fee? | Inquirer News