Hi!
As the title says, what happens if i get an address wrong? Do the coins get lost?
If that's what happens, why not change the code in Bitcoin, so that if the bitcoin network cant detect that address, returns the bitcoins to you?
If the address is exist it will a lost coin on your part.
The only way to retrieve it if the owner of address will agree to return it to you.
Its a blessing for the recipient.