For many it can be agreed that a good goal each week is to achieve your weekly cap in points. I believe this is consistent with the PvE mentality, particularly with the introduction of heroics now to help achieve that goal. Due to this mentality, this change does two things:
1. Slows the progression of obtaining PvP gear.
2. Makes the weekly arena commitment much larger (scaling to extremes as your rating increases)
Regarding (1), the argument is subjective. I'll trust Blizzard here on whether the pacing is correct. If it isn't, I'll accept that.
However, for (2), this I don't understand. You can achieve (1) without the impact of (2) in other ways. For instance, lowering the weekly cap as rating scaled up. Changing back to a games played format rather than a win-based format. The switch to the win-based format, while I understand its merits, causes each arena session to have an indeterminate amount of time. 10 games were indeterminate as well based on game length, but you could say they were fixed. If you lost a lot, you could be looking at an arbitrary number of games.
Lately I've encountered many games that have lasted up to 45minutes. That's huge for just 1 win, or worse yet a loss. Perhaps I'm an edge case. Either way you have just increased my time commitment by an amount that scales by how well I do. That large uphill battle only makes me less inclined to bother and of course with arena being my only source of PvP progression, I don't feel like I have much left to do in the game.
Basically, you're alienating me. I've had enough trouble keeping my gf interested in the game after the massive overhaul to the druid class (that ruined the fun factor in our opinion). I hope you reconsider.