After months of monumental effort, SK is made into a player corp as competition to VS. On top of the usual PR and HR and CorpSec positions, they hire cyberdocs to both ICly research new projects and offer custom chrome designs, much like VS researches new nanogens and offers custom biomods. With competing research projects, SK and VS race to see who releases their new thing first, while trying to get intel on what the other is doing in order to make sure they're staying ahead of the curve. They can employ full intrigue here, even going so far as to hire mixers to sabotage the competition in any number of ways.
NLM quietly (or not so quietly) fuels the conflict because it generates news and updates and bribes while continuing to be the holy grail for creative types who want to write news articles and movies and shows and superstar performances. It is at the center, playing both sides and raking in profit without having to needlessly antagonize the Mix (even though they still probably will.)
NeoTrans is kept as a faction, but it is a lesser corporation that other corps feed off, seeing as NeoTrans only has a port within Withmore rather than a real HQ. Their employees' status is somewhere between a service mixer and a full corporate citizen. NeoTrans becomes a route for wannabe corporates with hopes of being offered better-paying, more prestigious jobs at one of the Big Three once they prove themselves (with washouts possibly filling the higher echelons within NeoTrans). NeoTrans stays relevant in-game, however, because all three corps rely on them for [REDACTED].
Now that corpies have concrete incentives and weight in terms of competition, topside players have concrete incentives to compete with other corps beyond a vague sensation of 'well we should be competing,' with bonuses and promotions given out for good plotting and intrigue. Perhaps even a semi-automated feature that gives bonuses to one's weekly paycheck depending on how stocks are doing! And yes, the topside community is "divided," but not all positions *have* to be filled at every corp, much like how some Mixside positions remain empty for a long time until someone fills them.
In summary, topside becomes a more interesting, lively place that still accommodates current corpie playstyles but with an added level of danger, intrigue, depth and opportunity similar to what the Mix has, yet with its own unique set of rules and nuances that make it feel very different.