With Ellis X-work is easier, he mostly wrote or was involved with satellite titles, and what little he did with the main titles is easily avoidable if need be. Benching Wisdom is easier too, he is not a popular character, or a character that has appeared in other media, has not been involved in any main storylines or events. Lobdell contributions are more difficult to ignore, he pretty much defined the X-men in the 90s, and his characters have appeared in other media and been part of the main teams and storylines. You can stop using Wisdom tomorrow and it wouldn't affect the X-men at all, it is more difficult to do so with Lobdell, and I am not sure you necessarily should. But, if he still gets some royalties from their use, or you would have to put his name if you use them or his storylines, I can see Marvel (Disney) having an issue with it.