"So I was only wondering why Boeing hasn't come with a newer version of the 767, allowing the competition to take a bigger piece of Boeing's 767 market"
Included in the press-release announcing the termination of the B767ERX was a statement which explained that current B767 operators are content with what the current B767 product has to offer. I could see Boeing upgrading the B767 with modifications to the wing, but new engine? What could possibly replace the P+W4000 and CF6? The only possibility which comes to mind is the GP7000, which will power the A380.
Anyone who thinks that Boeing will increase the B767's cross-section width or produce a B777-100 is living on another planet. Boeing, while designing the B767, selected the set width for a reason, because of the competing A310.
I think that many people on this forum fail to see the B764ER's true role. It was specifically designed as a Delta requirement for an L-1011 replacement. Continental even realized the advantages of the aircraft and choose it to reaplace it's DC-10 fleet. The B767 (B764ER specifically) and the A330 do not compete directly. I think in some markets, the A330 is more compareable to the B777 A market, and in others, it competes with the B767. The reason that we are seeing so many A330 sales is because some airlines see the B767 as a little too small, and the B777 too large an aircraft. There is not a large enough gap inbetween the B767 and the B777 to warrant a whole new fuselage design. Both A330 and B767 have their own unique advantages, each operate their best in different markets. BTW, I believe someone mentioned ANA, and JAL, and QF are loooking to replace their B767s? Well, ANA just ordered B763(ER)'s to replace their B762's, JAL has ordered more B763(ER)'s along with B777's to replace it's MD-11 fleet, and QF's A330 order was only a tag on order to the A380 deal. I would not expect anymore QF A330 orders, and I see the B763's will stay in fleet.