Tribal culture has been around for eons before town culture, yet tribal peoples who live in towns cease to behave as tribal peoples. Neo-tribalism would therefore be a form of tribal culture that would cause Towns people to cease to behave as Towns people and behave in a fashion as if they were tribal.
There is a frequent thread of thought where people feel a need for a greater connection with people than what they are currently experiencing. The mythical answer to fill this need is 'Neo-tribalism'. (Even without defining the content of what constitutes 'Neo-tribalism'. Simply imagining that 'there must be a better way of living with humans' creates the theoretical concept that can be labeled Neo-tribalism.