It certainly makes more sense for it to be an end rather than a break, because if you were going to make it a break barring one game, *surely* you'd have the break after ME3?
Why though? GAME might not sell any ME3 copies this month, but they haven't had to buy any either. Maybe they feel its better to try and clear current stocks before they buy more...
The thing is, both GAME and EA know that ME3 has the brand power to be a success. EA are probably only offering the inventory at set bulk prices and GAME, rather than taking on extra stock that might not sell, doesn't want to take their deal. Maybe they want fewer copies or a cheaper price.
They're still the biggest high street chain, so they probably thought they could twist EAs arm and get a better deal... to be honest, it probably will hurt EAs sales of ME3 in the UK a little bit, but is that going to make them more amenable to offering GAME group a good deal? I doubt it.
Rather than allowing themselves to go into freefall by taking on new inventory that won't sell, they're trying to stem the blood-loss by managing things -- so this *may* be just a break.
If they can recover from this point forth, I'll be really impressed and maybe it was the right thing to do... if not... well. Maybe they picked the wrong battle.