Riot, before you go through with the GP nerfs, consider this...

There's even more GP nerfs on the PBE if it makes you feel better!

Gangplank

Parrrley [Q] - Now gives 4 gold and Silver Serpents on kill at all ranks (down from 4/5/6/7/8)

Powder Keg [E] - Now stores maximum 3 barrels (from 2/3/4/5, based on R rank) Cooldown changed to 20/18/16/14/12 seconds (from 18/17/16/15/14)

Cannon Barrage [R] - No longer increases maximum Powder Kegs stored (from 3/4/5) Upgrades cost lowered to 250 Silver Serpents (down from 500)

Judging by that video and my own gameplay, Diana is the one that should be nerfed imo.

It would help your suggestion if you actually made an argument instead of just linking a video.

All we can see here is that people lined themselves up and got outplayed.