Care to explain why you think it's infeasible? Then one could provide targeted counter-optimism ;)
I don't see what's infeasible about it. It doesn't seem too different from .po files (gettext catalogs) meshed with hooks for post-processing as would see in e.g. a handlebars, both of which have individually found great adoption.
Unicode consortium already manages a ton of language specs. If there's any group of folks I'd trust to understand languages (natural or otherwise), it's them.
This is the one. Think of all the "misconceptions developer have about X" lists, I trust Unicode to have encountered (if not written) all of them. The people behind unicode are thorough.
Does anyone have reason for more optimism?