Because we're basically out of time. All that is left is the Last Battle, upon the outcome of which everything else depends.

Aside from Egwene, absolutely none of those women had anything to do with the Tower split, except when they came to the Tower in the mistaken belief there was some good to be accomplished. Egwene's importance rests solely with the Tower. Claiming the Tower is important because of Egwene's involvement is the first half of a tautology. The others were renegades who are odds with the leadership of the Tower, and arguing with Egwene or keeping secrets from her more often than not. This common denominator suggests that the Tower might actually be a hinderance rather than a vital ally.

As for their -angreal, the same applies to those things that apply to channelers. They have more than enough between the Great Holding, Rhuidean & the Ebou Dar cache, and even the Tower's huge stash of things they don't know how to work will be useless without Aviendha to check them out. The Tower needs Rand & his channeling minions more than the other way around.

According to their own mythology. Deane is not famous for saving the world, she is famous for saving the Tower from its own problems. There is not one shred of evidence that she did anything of any benefit to the rest of the world aside from die fortuitously to spare humanity the domination of the Tower. Caraighan, likewise is famous for her exploits as an Aes Sedai, and not as a heroic figure who did anything for the world. That power and those capabilities of the Tower strongly argue that for "after" it is better if they do not exist. I didn't explore that issue, because I feel it is kind of pointless until we know more particulars of the outcome of Tarmon Gaidon, but the Tower is the biggest threat to the normal healthy development of the world to come.

The common theme of the dwindling and fading capabilities of humanity in the Third Age has been the White Tower. The Tower and its minions assert all sorts of positive benefits to the world (peace, civilization etc), but absolutely none of those benefits are unknown in the modern world, proving that they are possible without a White Tower. The only arguments that hold water are their services against supernatural threats, like the Dreadlords of the Trolloc Wars and male channelers, but channelers are killable. Everyone insists on Rand and Elayne having bodyguards despite being two of the more powerful and capable channelers out there, and neither one is a raving psychotic against whom every hand is turned. Yet their PoV chapters are still full of assertions on how easy it is to kill them, channeling or no. Offing madmen shouldn't be too much harder for normal people. Additionally, the series is chock full of examples of how channeling does better with competition. The groups that exist in fear of the Tower are more flexible and develop their own skills and far outstrip the Tower in numbers, despite a smaller population to pick from. The Seanchan damane are unmatched fighters, and we even see that the "threat" of the Asha'man has forced Aes Sedai to innovate. All a White Tower does is stifle innovation and advancement. They are committed to the status quo and its maintenance. Rand can hardly be the first person in WoT to found a school, but what other school's founding has produced such a technological revolution? The best explanation is the diversion of the Tower during the gathering of scholars.

"After" is the best reason to be rid of the damn thing.