I'm saying that fear of "fragmentation" is nothing more than fear that your preferred combo will not have enough people. In reality, the addition of a new car or track would not only have the possibility of adding new players, but it might also cause LESS "fragmentation" of the community. As an example...lets say that you've got a pool of 20 people. 10 of them like Car X on track Y and 10 of them like Car A on track B. Add in a new car and track and maybe all 20 would like the new combo. Now, you've just UN-fragmented the community!
Do you think the number of servers is limited now? Was the number limited before the new Aston configs came out? Was the number limited in S1? On the other hand, take something like nK Pro - only four tracks and three cars, but virtually NO servers! More choice does not necessarily mean fewer people per server.
This just doesn't happen. People will gravitate toward their favorites and toward other players. You don't want to drive on the track alone, right? Neither does everyone else! If you take a look at LFS right now there are a TON of combos 800+ at last count) , not including an unlimited number of autocross layouts. Despite this, virtually every populated server is running one of about a dozen well known configurations. That means that we're running only about 2% of the track combos at any given time. So, I guess LFS must already be "fragmented". The same thing was true before we got the new Aston layouts and the BF1. The same thing was probably true in S1 (though I wasn't around then so I can't say for certain).
I personally think paid add-ons is a bad idea, and said so in my first post in the thread. However; the only way this would negatively impact you is if people that you currently play with abandoned playing with you to try something else. Realistically, if they drive with you now they probably like the same types of cars and tracks as you. So, if they quit racing your favorite combo and move on to something else, perhaps you might get enjoyment by doing the same.
Whatwill you do when the S3 alpha/beta comes out? Will you buy it? If so, what's the difference between buying a large upgrade later or smaller, incremental upgrades now? If you don't plan to buy S3, what will you do when everyone else does and you're left with S2? This is the same scenario you'd see if there were add-ons available. This is the same scenario that every game goes through. A sequel inevitably comes out and people buy it and move on. You either go with the crowd or you play alone. It's the same thing here.