I'll give it a go Jim.
In 2017, the GPS 1st and 2nd XV competition will comprise 1 x round of 5 matches. Prior to this the GPS schools will play 1st and 2nd XV trials against CAS schools. In the 3rd XV, Newington won't field a team and TAS will take their spot in the draw, so the 3rds will be a 1 round competiton of 7 rounds (only 8 teams). Additionally, TAS will play all matches in Sydney when playing schools with teams in the 1st and 2nd XV competition - not sure whether High and Grammar will continue to play home and away in alternate years or not.
In addition to the 1sts and 2nds only playing 5 GPS games, the first game is played on the 2nd last Saturday in Term 2, then there is a 5 week break until the second game on the first Saturday back in Term 3. You'd at least have thought that they could play the games on 5 consecutive Saturdays in Term 3.
I'm not sure how this all filters through the age groups - for example there are age groups where Newington have more or equal teams than Kings. Where TAS will fit when Kings play New is going to be interesting. The logical follow on from this is that Kings will soon have less open teams than Newington when numbers flow through - which will make even more of a mess of the 3rds competition.
My understanding is that Joeys pushed hardest for this and no doubt had support of others.
It has only been agreed to for one year.
I'm not against change, in fact the change which resulted in the inclusion of TAS, Grammar and High in the 3rds and a 6 team, two round 1sts and 2nds competition seemed to be a good change.
I honestly can't see how this improves anything - unless you are the person who organises the buses at Joeys, who will now have less destinations about which to worry.