I hate to ask this, because it seems like oftentimes when people ask these types of questions that they usually take on an offensive tone, but was Spidey 2099 not quite selling well enough to garner continuation? Or was this a result of the post Secret Wars shake-up that we'll be experiencing? With you all the way, regardless!
When there is no universe, there are no titles.So add SPIDER-MAN 2099 to the list that includes FANTASTIC FOUR, AVENGERS, NEW AVENGERS and all the rest.