The 380 will be fine, it has one major advantage over all of the others and that is the carbon footprint per passenger has to be wildly less than other aircraft. This may not be a massive deal just now but give it a few years and i am sure that it will be far more important. Things will start to change when it enters airline service and becomes proven.
The 747 had its share of problems at the beginning and endangered the boeing company but the problems where sorted. Talk of cancellations by airlines i am sure in the most part is spin to get decent discounts and compensation from airbus.
The idea of a joint boeing/airbus company is laughable and worrying at the same time, can you imagine how a company with that sort of monopoly could operate !. The world needs competition and so needs at least 2 large airliner manufacturers, and these companies are very similar just the american gov helps boeing in slightly different ways to the european way of helping airbus, both lots of governments aware that these manufacturing jobs are some that might actually stay in the western world as they are not easily transferrable to the far east etc.