As I searched, it is because NS2 simulator last release was in 2009 and there is no maintained or updated version since then, and low community support.
so researchers have moved to NS3 because NS3 performs better than NS2 in
terms of memory management, NS3 is trying to solve problems present in NS2.
NS-2 also has two disadvantages in term of its scalability and the real-time system is too complex.
NS-2 was discontinued in terms of developer support, new contribution to code and removal of past bugs. My graduate students informed me that it had been started being reported on Internet as early as 2013 that reputed journals have stopped taking submissions where simulations were conducted in ns-2. I switched over to ns-3 for my graduate students since then although its code base is still not as rich as ns-2.
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