The king wants to make sure Thaksin is OUT before he dies or else his useless playboy son will be thumbed by Thaksin who might return as king again as KING Thakin 5 generations ago be for general Chakri de-throned him (another Taksin.. a Teochew guy...)
Yes, that is actually the biggest fear of the current demonstrators. If King dies, Son becomes King, Thug Sin returns as the power behind the throne.
The latter helped him tremendously during the Prince's difficult times. That is why the current demonstrations is a do or die affair for everyone.
Thug Sin meantime, resting in Sentosa Cove, where rumour has it that he's got a place there.