I voted for "fix it", as in "try to fix it", but if fixes don't really work then, like the Crusierweight division that started and died out before in WWE after WCW, it may just have to go.
But, I don't see WWE scrapping the Crusierweight division anytime soon, but definitely making some tweaks and improvements will probably happen, and probably NEED to happen if they want to maintain a certain level of regular viewership.
Some problems I see with the Crusierweight division now is that, while I understand the need to let each talent get some time to flesh out their character as individuals, I think a better way to get interest and opportunity into the division would be a big heel faction.
Because it often seems just too random and boring for why most of the Crusierweight matches are happening. But if, for example, "King" Neville came out with a bunch of other heel Crusierweights who pledged their allegiance to him as "King of the Crusierweights" and would do his bidding for him and started SERIOUSLY wreaking havoc on all face CWs, then NATURALLY more people will start to take notice.
Just imagine a Nexus-like debut for Crusierweights. Massive damage and a heel faction with at least 4 members in it would cause people to take notice and help babyfaces have a reason to show what they got to fight back and see who the fans really get behind.
Personally, I don't really like having two segments for Crusierweights, I feel like if there can always be a mega story line that is the focus for one Crusierweight segment on Raw then the WWE can promote any further matches or storylines that may occur on 205 live and then next week on Raw show quick recaps of events from 205 live that build onto Raw storylines.
I feel the weight-class limit is going to make the CW Division always be more hampered for creating interest than the rest of the show and I think WWE has to be pretty careful about who on the current roster goes up or down to the Division because it could quickly hurt the MAIN ROSTER, too.
What happens if Finn Balor who already is former Universal Champion goes down to CW Division? What does that say for Neville, who may be a few inches shorter than Balor, is clearly more jacked than Balor or even Tony Nese, who while has been made to look bad in the CW Division is pretty close in height to Balor and ALSO has a very jacked physique.
A guy like Kalisto, actually should be in the CW Division but those CW-types are also kind of needed on the main roster for jobber matches so you can't get rid of all the smaller wrestlers and send them to the CW Division. So, either the CW Division keeps getting an influx of NEW talent, but then has to do more work for building up the new talents so fans can accept them or runs the risk of hurting overall their main roster talent's credibility if they go from CW to main roster divisions.
My short answer?
Start at big, ruthless and destruction-heavy heel faction-based storyline with a heel Champion at the top. Let that faction run for a while, even if it means some members drop out and others join and some smaller face factions try to rise up to defeat them.
Give the CW Division a real chance to be interesting with a big over-arching storyline that goes on for at least 6 months and THEN see where the Division stands in the eyes of the fans.