Standard rewards are very difficult to obtain in advance in many travel markets. Last minute availability is nice, but many folks using miles do so planning months in advance. The fact that CO makes makes a large percenatge of its standard awards available in the final days before a flight doesn't help those who book early. Furthermore, standard rewards in TPAC/TATL J are exceptionally difficult to obtain in advance.

The fact that CO is apparently not changing the standard reward redemption mileage for Asia/S.America J awards is, frankly, an implicit reflection that these rewards are all but impossible to book.