I disagree.
Part 2 and 3 were both filmed at the same time as part of one huge movie, then they split it in half. The second Matrix came out over 3 years after the first, while the 3rd part is coming out in just a couple of months. It will only have been 6 months between part 2 and 3. A lot of people knew this and expected an ending like the one you saw. If I had to wait 2 more years to see part 3, I would agree with you.