While Lisle, Naperville, Warrenville, and Woodridge appeared to have little interest in merging, the long saga does raise a possibility: should more suburban governments consider merging?
The primary reason not to is that many suburbs and their local officials want to maintain control over what happens in their community and near their homes. Larger communities may make decisions for the good of the larger community that do not necessarily benefit certain members of the community. A smaller government provides closer oversight as the individual votes of residents count more.
A second reason for not merging is that suburbs often see themselves as distinct communities. Even though an outsider might see it all as one amorphous blob of suburbanism, many suburbs have long histories and distinct characters. In this particular case, these suburbs may define themselves partly as not Naperville: we are still a small community with a distinct feel.
On the other side, there may be multiple reasons to merge: financial economies of scale through combining particular city services (for example, having one police department rather than four), increased visibility and status with a larger size (controlling more land as well as having a larger population), broadening a tax base, and some communities may have mutual interests due to similar demographics, locations, or like-minded leaders. Imagine an even larger Naperville that controls a lot of land along major highways (I-88 and I-355), has a diverse tax base (particularly due to a lot of office jobs), thas efficient city services over a broad area, and is clearly the largest suburb of Chicago (Aurora currently holds that distinction). In the long run, is it feasible to keep so many suburban governments going when budgets are ever tighter? Is it worth protecting local control and distinct characters at a higher cost?
The only way I could see suburbs seriously consider merging would involve difficult financial times looming on the horizon. Even then, many suburbs may not want to take on the communities that have a weaker financial standing or a lower status.