Not particularly, it is still mentioned in relation to three more prominent factors. I go into some detail in this answer to 'why did the Khmer Empire collapse?'

Most recent studies posit that climate interference was more relevant to the transformation of the 'Khmer Empire' into the 'middle period' of Cambodian history and the shift from Angkor to the area near Phnom Penh. As I outline in that other answer, there were signs of 'decline' prior to the widespread adoption of Theravada Buddhism, and while it may still have played a role, the rise of the proto-Siamese kingdom nearby and the effects of long-term drought and subsequent flooding are likely to have played a detrimental effect to the infrastructure that the city of Angkor relied upon so heavily.