I have been reading Ultimate X-men from the beginning. It still had potential when it was bad. And they are ending it after 100 issues? There is so much to be explored. Even the other ultimate series like UF4 can explore so much more. Wasn't the ultimate universe making marvel enough money? Is it worth being wasted on a money based crossover like ultimatum?  Especially when there are at least one per year (civil war, house of m, and secret invasion, anyone?). The ultimate marvel universe is too good to end now. I hope I am not the only one who wants it to be saved.
P.S. I know not all the ultimate titles are ending, but many are

Ultimatum to me, was not the end, but a new begining. Every comic book universe has to go through a major changing event. For the DC Universe, it was Crisis on Infinite Earths. For Marvel (616) it was Secret Wars. For Ultimate Marvel, it's Ultimatum.