The elites and military.
They brought PTP into power as the lesser of 2 evils. They thought they could make a deal withThaksin that would benefit them. Everyone knew the deal would eventually fall apart.
Thaksin punishing Chidcob by removing backing to Buriram and then working to get the F1 in Bangkok, not at Buriram, started the ball rolling.
Thaksin did not stay at home with the grandkids, but has proven himself to be the voice and head of the government. His daughter has shown that she is worse than his sister was and is totally useless on a foreign leader's front.
The casino and the way the country is going financially are wrong, and they know they have to think after the phone call that the government is moving in a way that is not good for the country. Consider that the area they are discussing has been like that for a long time. Why is it so important now?
If possible for the good of the country, I can see the leite trying to broker a deal with PP that would have them in power but Anutin as the leader so that they can get the experience. It is doubtful but it is the oly way to not have to go to an election and watch the military parties and teh DEMS disappear. PP will gain power and could get enough seats not to need a coalition with a major party.
That would definitely be harmful to the elites