Ahaha. The first time I watched those episodes were downloads in low enough resolution and quality that at first I wasn't sure what it even was. But it doesn't stick around long, disappearing as mysteriously as it appeared.
Considering other episodes that have ended up with novels following up on dangling threads, that doesn't seem too farfetched--though they'd probably feel forced to come up with some other crazy adventures for him rather than "Sat around waiting".
Yeah, safest-for-timeline is pretty dark. But getting involved with people, especially to the point of marriage and children, would spin out to all kinds of differences he wants to avoid.
Going to another franchise for a moment, in Star Trek First Contact when it's unclear they'll be able to return to the future, Picard gives orders to the crew on the ground to "find a quiet corner of North America and stay out of history's way". As one man, Mitchell would have a much better chance at pulling this off than they would've in that movie.
It doesn't really help answer the question, but I'd say that just because Goa'uld took personas doesn't mean every legend about those figures is based on the Goa'uld, or even if it is that it's at all accurate.
So yeah, somewhere between 5,000 and 200,000,000.
Hard to be certain, but if he was responsibly trying to correct the timeline to be as close as possible to the one he knew, getting involved with someone and starting a family is the kind of thing that he'd want to avoid. Perhaps easier said than done, though.