Before the Frankberg Tragedy, Carmen used a series of means to consolidate the power of the Rothschild family into his hands. After he used Celestial Trade to kill his brother in Pilsner Synagogue, he dictated the family.
For this very reason, his death meant the end of the Rothschild family.
Jiang Chen could foresee that once the revolution comes to an end, the New Choice Party would have to step down and the "crimes" committed by the Freemasonry would be punished. Rothschild and other families' assets would be auctioned by banks to repay for the high penalties.
In the foreseeable future, even if Jiang Chen didn't do anything, the Rothschild family would still enter a decline fueled by an internal feud over asset division.
They were filthy rich.
However, they were at the same time, too weak.