First things first: there are part-time and non residency programs, summer programs, etc., anything to fit your need. Education is a business and fills the needed niches.
There is also a "lit mafia" for poetry, short stories, creative nonfiction and literary fiction. Many of the little magazines exist only to publish MFAs, and some won't even look at your work without seeing the CV and list of credits from other little magazines. It is all very self-referential and incestuous, but very few of those writers ever break into commercial publishing in a meaningful way. It's meant to give people the publishing credits so they can get jobs teaching workshops, as instructors in other MFA programs etc.
That is not to say that creative writing programs aren't valuable. My undergrad degree is in creative writing and it worked for me, because it brought me to the point where I was confident about my work and didn't need school anymore as a motivator (not that the drinking and sex in monastic quietude and other settings were not valuable as well). Many, many, many people are in MFA programs because without the MFA program they simply do not write. And that is the real key in this business, and the difference between those of us who are writers and who want to be writers - continuing to write, and finding reasons to do so.
Twenty years ago - (after I didn't get in to the MFA program, which was basically because I had a lousy job and was desperate to do anything else) I got together a small group of friends who were interested in writing. We met every 2-3 weeks in my apartment to drink beer and read our work aloud. We didn't critique, just shared and got drunk and talked about writing. But it gave us all the motivation we needed to keep writing - no one wanted to be embarrassed by showing up with nothing. Of the five or six of us in the core group, which disbanded when I moved in 1993, one guy has since published several small press novels and teaches. Another writes for a newspaper and just started publishing short stories in those little magazines. One's on disability, just started in an MFA program and is starting to publish. And I've been supporting myself by writing exclusively for almost 15 years.
The key is to find a reason to keep writing, and not just keep putting manuscripts in a drawer. That can be, but does not have to be, an MFA program. Share your work with others in readings or workshops - many are free in large cities - or start your own. Develop and cultivate a network of people interested in writing. In the end, you create your own MFA program. If you share your work, and it's good, it will find its way into print. Query writers you like. Read up on their background - how they continued - or call them up and ask. If they're like me, they might just be isolated enough that they don't mind talking about it.
Without getting too zen, there are many paths to get there. An MFA is one way, but it's awful busy and well trodden. But there are other ways, too.
Twenty years ago what I am doing now was unfathomable. I had no connections, no trust fund, no marketable skills but a work ethic. I thought writers were other people.
They're not.