It's not just the sentence itself. Defending his case was ruining his finances. Once out of prison he would have faced numerous hurdles, which would become more severe if his sentence were longer.
This is not to say that suicide was the right choice. Rather it is to point out that we are not talking about a slap on the wrists; the prosecutor was going for his throat. Any rational person would be scared in that situation.
Now is a year is an easy sentence? Probably not, but it's certainly not a very hard sentence. Either way according to Dr. Lessig the sticking point for Aaron wasn't the length of the sentence, it was the 'felon' label.
All the other hurdles you've mentioned, all of them, are surmounted all the time by much lesser men than Aaron. Sometimes I think that Aaron might have actually started to believe the type of crap that gets slung around here on HN about how being a felon ends your life, and I wonder if that had any influence...
[1] http://cyberlaw.stanford.edu/blog/2013/01/towards-learning-l...