What happens if you destroy every Crimson Heart, Shadow Orb and/or Crimson/Demon Altar? [closed]

I'm not exactly sure about what happens if you destroy every Crimson Heart, Shadow Orb and/or Demon/Crimson Altar? My guess is that it stops Corruption/Crimson from spreading.

Also, how do you destroy EVERY PIECE OF CRIMSON?

According to the Terraria Wiki, there isn't a special consequence of destroying all altars or orbs. Only the normal things are happening like the chance of spawning a meteroite or the increase of one hardmode ore amount like Titanium. There is also this information:

If all corruption/crimson and hallow blocks are purified, then when speaking to the Dryad about the world status, she will say "[name of world] is completely pure. You have done an amazing job!". http://terraria.gamepedia.com/The_Corruption

But I don't know if it will spawn again. It is a waste of time to try it, because you need items and lore from there and when your world is in hardmode, the corruption/crimson is spread anywhere from the surface to the hell. It is a huge amount of work to pure it.