Currently it reconciles the three most prominent natural astronomical phenomena about as well as possible (day = time for the earth to rotate once; month = time for the moon to rotate around the earth; year = time for the earth to rotate around the sun) so until we settle multiple planets there’s no pressing argument for change.  I suppose the idea of a month isn’t as important in the scheme of things but even here there are real implications (eg tides).

Now our time system is a different matter, since hours, minutes and seconds *are* arbitrary units.  I can see the argument for a metric version of time in an era where time zones are the cause of many mis-scheduled meetings!