It would be really cool if the Nether existed IRL
Potions would be real
The Wither, and by extension Beacons, would be real
Glowstone would be real (infinite light)
RENEWABLE GOLD WOULD BE REAL!!!1!
That would also mean that element 116 exists (and 117, and 118) because Netherrack has several unknown elements in it (Source: EDU Chemistry, experiment conducted in Bedrock)