The real barrier I've discovered is perception: we've been convinced of the notion that, like cars and other things, we need the newest, fastest, shiniest computer available. People almost disdain 'used' computers.
These all seem like pretty cost effective options. It’s certainly much cheaper than when I was a kid.
Also, if people are lucky enough to have an electronics recycler near them, I always recommend buying refurbished machines there. The prices are great and (at least with the one near me) they come with a warranty.
Save up, $10/month for 5 months, and get a used laptop that will likely last for years. If someone can't afford that, then it simply isn't a priority for them, which is fine.
The bigger issue for someone in a very rural area is getting internet access. That will be a bigger issue and expense than the computer. Over time, internet is likely a bigger expense for everyone than the computers they use to access it.