when are black holes being renamed?

Really?

If a certain group fights for this kind of thing it is mostly not the racial minorities in my experience of the people i see talking about it on social media.

I do not think it is that nice to have a certain group of people controlling the interest of what minorities should care about and when that certain group of people stand outside that border of minorities they talk about it is even more worrisome.

A foot is a very useful measurement that has not been replaced at all.  It just doesn't exist in the metric system.  People use it in the United States all the time even though we also have the yard, which is generally equal to a meter.  Which tells me that, if the metric system had a unit similar to a foot, it would probably be popular as well.

If we take away the measurement of a foot, sure we could get by, but the reason why the foot was created and why it remains in use is completely because it's such a useful measurement of distance for when an inch is too small and a yard is too big.

The thing that you don't seem to understand is that the metric system units weren't created to be useful or by people looking to measure their world in a meaningful way.  The metric system units were created by the happenstance of a fraction.

Sure, 5,280 feet.

But you've reduced the question down to something that's largely irrelevant -> Conversion.  For some reason metric supporters (popularized by untold numbers of elementary and middle school teachers) think this is the one and only consideration for adopting a measuring system.  And while it can have its uses (mostly in the scientific areas where very big and very small units are required), generally it not really all that helpful.

A mile was created to measure fairly large distances.  Does it really matter if you know how many feet that is?  As long as you've got a good estimate in your head for what a mile means, who cares what number of feet it takes to get there?  Conversion is a largely irrelevant consideration.

Do you generally use centiliters?  If not, obviously, your culture obviously finds it irrelevant.  Which makes me curious what it would even be brought up.  I mean, I wouldn't bring up a furlong for measuring distance.  What would be the point?  It's not used enough to be relevant to the conversation.

Me?  I'm not the person who came up with the need for teaspoons, tablespoons, cups, pints, quarts, and gallons.  So some, presumably regular, persons must have have decided that measuring 100 teaspoons* actually was too much and invented the pint to make life easier, or however the process must have gone.

Someone thought it was important enough to separate each of those units and and those units became and continue to be popular enough that they remain in common use even in the modern age.  So, the question becomes, "Why?"  And the answer is that is was useful.  A single cup meant something, as did a pint and a gallon.  And its use has continued consistently into the present, which means that those units of measurement remain useful.

Because of the rigidness of the metric system, none of the units between milliliter and liter fall into a category that people use.  So you're stuck with only the two.  Can you get along with only two?  Sure.

Does qualifying as good enough make it superior or even equal?  Heck no.

*Quick edit to short-circuit a gotcha response.  I know that a pint isn't exactly 100 teaspoons.

Yep, And I just said one of the very common ruler is a 30 cm one for daily use on small sizes. But also there is the 50cm let`s say for drawing, and then we have the "measurement tape" that go usually 1m, 1.5m and 2m for tailoring. Also there is the 3-15m for construction, etc.

I think you need to read back through your comment and rethink about who screwed up.

And the worst of all is metric's ugly cousin, Celsius.  It totally tossed the humanity out of the scale.  With Fahrenheit, the scale rationally places 100 degrees at an extreme of hot weather and 0 degrees at an extreme of cold weather.  Celsius tossed that out the window and asked water of all things what it felt about the weather.  Who cares whether an ice cube thinks it's balmy outside?

In doing so, the Celsius scale has much larger difference between each degree, again making it less useful.