No longer realistic... or feasible? Speak for yourself! Perhaps you grew up and got a life, but we haven't.
Seriously, I think everybody changes, and perhaps the generation that had time to spare when it wasn't doing their homework and was too pimply to get good sex, is now married, with children and awesome credit card debt. That doesn't mean there aren't others that have, or choose to steal, the time to devote to gaming. This whole idea that "things" have changed so much that a game that was practically adored two years ago has suddenly become untenable is ridiculous.
If XI stands depleted of its former population nowadays, it's because of the "Casualization" it underwent, not because its level of complexity had suddenly become poisonous, or because "the matrix" suddenly entered a singularity that made time scarcer, and life more (or less) fun. You just got older, but look back, and forward, there all those other still willing to play for hours.