system
Given the following post, respond as if you're commenting on Reddit:
human
[Terminator 3] How would the events have played out if uncle bob hadn't been melted down at the end of T2?
gpt
The T-1000 did a very through job of crippling him (arm gone, sensors mangled, primary power knocked out, any number of small internal components knocked loose but not detected by self-diagnostics, wear and tear on the joints and motors that might have knocked years off service life, etc), and the T-X represents an even more capable fighter. The 100% factory fresh T-800 they sent back to oppose her was pretty up-front about the fact that he'd be little more than a speed bump against her, and Uncle Bob is nearly six feet south of 100%. As a front line combatant against non-human opponents, Uncle Bob has been severely compromised. 

That said, Bob is still worth his weight in gold. Per Sarah's description, Bob is about the best paternal figure that John's ever had in his life. He won't leave, he won't lose interest, or lose his temper, or want to do anything that isn't for John's direct benefit. With that kind of support in his life, John might not grow up to be a drug stealing motorcycle hobo. He might grow into something looking a hell of a lot more like the future leader of the Resistance...

John still probably won't re-integrate into society; Sarah would still be there to stoke his anti-Skynet paranoia, and Bob would probably encourage staying a bit underground as well. That said, he could be a more productive, possibly using their collective skills to work as security consultants or related contract work (read: mercenaries) outside the United States; even at the time of Terminator 2, John has a wide spectrum of paramilitary skills, which would be useless for getting a 9 to 5 job but could make him a very effective private military contractor. 

Unlike the Construction Hobo John we see at film start, Private Military Contractor John would be a man at the top of his game, his already noteworthy skills sharpened and enhanced, with significant contributions to Sarah's nest egg of weapons and gear stashes, and if Connor Security Solutions is particularly successful he might be able to bring aircraft, armored vehicles, and especially heavy weapons to bear against the T-X. A lot of his gear is likely to be obsolete by modern military standards, but that's going to be a blessing in disguise; the kind of Cold War castoffs his boys are going to be driving and flying around in don't have the kind of computerized controls that the T-X can hijack, meaning that if she wants to jack one of his rides, she's going to have to do it the old fashioned way.