The purpose of NIWA is to make a network of wikis on individual Nintendo topics, rather than one messy wiki with everything, disambiguations every, constant notability issues due to the sheer size, and a difficulty to manage. Also, people tend to prefer information from a dedicated source rather than a mass collection. (e.g. Do you go to Wikipedia or Mario Wiki for information on Mario games?)
NIWA allows us to have independently managed wikis linked together to form a network of Nintendo information.