THE KATHIN FLAGS are fluttering in the autumn gusts again at Wat Suwannaram in Bangkok Noi at Wat Pradoo Nai across the river in Bang Phlat, but there's been doubt about how many more years they'll make their annual appearance. For two and a half millennia the white flags imprinted with dramatic emblems have been flown to mark the end of Buddhist Lent, but, as with so many traditions, interest appears to be on the wane.