I don't think the 2015 scenes were completely campy, I'm the kind of guy who doesn't mind product placement as long as it stays realistic, (remember, the day time scenes are set in a shopping mall, when you get to hilldale you see a kinda run-down, obviously aging neighborhood) which the 2015 scenes do, as for the flashy-ness, the outfits are a dig at old people and "crazy new fashions", and once again, shopping mall, supposed to be flashy
edit:
I can see it now, Terminator 3x01 "there & back again"
Scene: Zeiracorp basement, John's time bubble has just disappeared
Sarah Connor: Sarah slumps against wall, crying "I love you too"
Another time bubble appears, a nude, mid 20's John, with SKYnet work camp tattoo and assorted scars, and a nude Cameron emerge
John Connor: runs up to slumped Sarah "MOM! I'm back, and I know how to defeat SKYnet
Sarah: Sarah gazes upon the face of her son, with a look of confusion that turns to realization that turns into detemination
>cut to Terminator: Sarah Connor Chronicles logo<
second edit:
A theory I have, we never realy see "future" John, I beleve that the John from Derek/Jesse/the whole TSCC's timeline is the "Young" John from the past.
We have only seen future John's actions from removed perspectives *if they showed the John from the future to be early/mid 20's instead of 40's it would give it away* and that John was distant with a number of prominent resistance fighters because he KNEW he would send them to die, that and his obsession with cameron and his willingness to work with "metal" spawned the somewhat baseless recluse rumors