If their password was actually good (18+ random characters) it's not feasible with current day technology to brute force, no matter how few PBKDF2 iterations were used.
Obviously it's still a big issue because in many cases people don't use strong enough passwords (and apparently LastPass stored some of the information in plaintext) but a strong password is still good protection provided the encryption algorithm doesn't have any known exploitable weaknesses.
If their password was actually good (18+ random characters) it's not feasible with current day technology to brute force, no matter how few PBKDF2 iterations were used.
Obviously it's still a big issue because in many cases people don't use strong enough passwords (and apparently LastPass stored some of the information in plaintext) but a strong password is still good protection provided the encryption algorithm doesn't have any known exploitable weaknesses.