during the Mayhem event we always see a lot of people come to PVP just for the event, and there are often extra campaigns added so people can play. currently there are 4 cyrodiil campaigns, 30 day CP, 7 day CP, "lowbie", and NoCP no proc. I feel that lowbie and NoCP are effectively the same, theyre designed for new players who may not be as experienced in PVP. As it stands now, there are very low activity of players on either campaign. only during prime time, is there enough activity. With battle leveling changes during OneTamrielTM, I feel like low level players still have a fighting chance in NoCP.
Similarly, CP campaigns are very similar. The main difference is that one is alliance locked, and the time difference. I understand that players do want an alliance locked campaign, although I personally feel that unlocked alliance is better for competition and balance. So if there are a reduced number of campaigns then hopefully that will also promote activity in each campaign. One campaign can stay as is, Grayhost, CP proc enabled campaign with alliance locked for 30 days. Then a new campaign can assume the opposite attributes, an unlocked No cp No proc campaign for 7 days. During Mayhem this can be adjusted as needed.
Objective is essentially to eliminate 2 campaigns that are mostly dead, and lump it with the 7 day campaign to promote more activity on the NoCP server. Currently I feel like a lot of issues like heal stacking are not as bad in NoCP and PVP is enjoyable. Drawbacks to this would be that players on the current 7 day campaign would have to play on Grayhost if they want to use CP and procs. Also, players who main on Grayhost may have to sit in longer queues due to this. Ideally promoting the NoCP campaign can promote more learning environments and testing environments for ESO PVP.
I would also suggest buffing defile to help counter the healing issues, and increase mount speed overall in cyrodiil as it is notorious for being a "horse riding simulator"               
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