What is the reason CMOS took over as an inverter for fabrication of gates?
CMOS took over as an inverter for fabrication of gates?

1) Not only for inverters (you cannot do much with only inverters) but logic (digital circuits) in general.

2) the low power consumption of CMOS is only a secondary effect. The real reason that CMOS technology is the dominant technology these days is that it scales with size. Meaning that if you make the transistors smaller, the circuits become faster.

Making the transistors smaller is essential as that means for a given silicon area, more functionality can be implemented on that same size.

NMOS technlogy for logic is completely obsolete now, this was done in the past because there were no better solutions. Once they figured out how to do CMOS no one needed NMOS anymore. The exception is chips for other applications than logic (like high frequency applications) where only NMOS transistors are avaialbel for making logic circuits. But then that is only for logic consisting of a couple of gates, even a simple micro Controller would be to complex and power consuming already.

there is some static power dissipation in NMOS with saturated load and linear load and with NMOS with depleted load. That is a very confusing sentence. You should provide more context like a schematic, before anyone can answer that. It probably has to do that with NMOS logic, when the NMOS is on a current flows. This current does not flow when the NMOS is off.