What happens to the worst players?
Well, there isn’t really a difference in emerald vs. sapphire in terms of how the pip-loss works and tiers, etc, so, theoretically, being in emerald/sapphire at the end of the season really just means you didn’t play enough games—a normal 50% win-rate with fluke win-streaks is enough to get anyone to ruby by the end of the season.
Well actually, if I understand this, …. if you are in the bottom 5, you will be matched with the other bottom 5 available at the time. You will then be playing against teams with players who’s MMR’s rank above all of yours. So if you get really lucky those people just joined PvP for the first time and have artifiically high MMRs and you can maybe beat them…. but if you are really the bottom 5 you will basically be likely to lose every match. At that point beg a good team to let you group with them… gain some MMR and get added to a group that is better than the now bottom 5.