#3 The problem: The Cruiserweight division isn't catching on with fans
Neville won't save the Cruiserweight division. Enzo Amore won't save the Cruiserweight division. No one will.
The Cruiserweight-only show 205 Live has reportedly been doing poor viewership on the WWE Network, one of many indications that the division simply isn't catching on with mainstream fans. The division has plenty of talent, with guys like Neville and Cedric Alexander exemplifying that, but their appeal is limited.
Why? Because many Raw and SmackDown stars can do the same stuff they can do in the ring and have much more star power.
The solution: Integrate them with the rest of the roster
If WWE insists on keeping the Cruiserweights around, the ideal fix for their struggles is to integrate them with the rest of the roster.
Essentially, that means stop isolating them to 205 Live or Cruiserweight-only matches on Raw. Instead, mix them with the rest of the roster, whether that's by putting them in the tag team division, Intercontinental title picture or non-title midcard feuds.
Regardless, the logic is the same: Let them interact with non-Cruiserweight stars, who are more likely to get them over with the masses.