I think RL fans are getting scared and expencting less Internationals. The proposed schedule could see them play 6 Internationals and still have players back to their clubs before December. The general consensus seems to be that the clubs/players will never agree to that many games, even though in the past the International season has gone for 6 weeks or more plenty of times.
Thing is you could swap the name and have the same tournament/tour setup when GB tour NZ/Aus or Aus tour England. Throw NZ & Aus in a Pacific Cup whilst GB tour to beef up the schedule. I find the prospect of 3 game series pretty boring TBH.
I like 3-test series if they are part of a tour.
Say in 2019 if England/GB tour Oceania and NZ play in a Pacific Six Nations:
Mid-Season:
NZ v Tonga/England v Samoa DH - Eden Park
PNG v Cook Islands/Italy v Lebanon - Sydney
Week 1
NZ v Fiji - Hamilton
Tonga v Samoa - Auckland
PNG v Australia - Port Moresby
France v England - Toulouse
Week 2
Fiji v PNG - Suva
Samoa v Cook Islands - Apia
England v Tonga - Auckland
NZ v Australia - Dunedin
Week 3
NZ v PNG - Whangerei
Tonga v Cook Islands - Nuku'alofa
England v Fiji - Wollongong
Australia v Samoa - Newcastle
Week 4
Pacific Six Nations Final - Auckland
Australia v England - Sydney
Week 5
Australia v England - Melbourne
Week 6
Australia v England - Brisbane