People go to Europe for enjoyment. The other places you mentioned aren't, um, "vacation" spots.
Saudi Arabia has NO TOURISM, no tourist visa. The ONLY folks who visit it without the requisite visa are those on cruises where the Red Sea is a port stop. Even then, it's off and back on the ship after only some hours.
There REALLY, REALLY, REALLY is nothing to see...not a blade of grass, nothing green, LOTS of camel spiders (I was bitten by one.), dust, dirt, wind, rain only once every five years or so for MAYBE a few minutes. They DO have one pretty thing, a rock, called the "desert rose," pinkish quartz, pretty.
God gave those Bedouins a horrible place to live...then in the 20th century He gave them geologists who discovered PETROLUEM (black gold, Texas tea--Beverly hillbillies) the likes that have rarely been seen before.
The Saudis really don't care about the money. They just want to sit around (segregated from the opposite sex, of course), drink tea and talk about ... everything, all day and night long.
God has a very odd sense of humor, doesn't he?
Whattabout Camel races?
So the glassification of Mecca and Medina won’t have a significant environmental impact?
I know ex-pats who can confirm that is exactly true, although they said the conversations were restricted solely to children and religion. On that basis, they didnt bother to learn any arabic.