MLK B'day

Today, we celebrate the birthday of Martin Luther King as a national holiday (banks, schools, gov't., etc are all closed). I think that this shows how far we've come from the days of slavery in this country.
Interestingly though, is that of all our national holidays, only two celebrate human beings. Those are the births of Martin Luther King and Jesus Christ. Even the Presidents that we used to have holidays for (Washington and Lincoln) have been lumped together into what we cal "Presidents Day.
So, from this, can one draw the conclusion that we have enough holidays and that as we come up with more, we'll just lump together already existing ones ?
Although they're not national holidays, I think it might be appropriate to put Valentine's Day together with April Fool's Day. and celebrate it on Sadie Hawkin's Day.