I have to believe that if hackers hit the treasure trove of Lastpass customer passwords, Instagram is not going to be their first target. We'd be seeing financial fraud first and foremost, likely sparingly at first, to not alert everyone to the fact that all of our passwords are compromised.
Your probably right, but I'd assume financial attacks would be highly targeted after verifying they have the proper passwords via using places like FB that will just ignore you endlessly if your account is hacked.