What do you guys think? Do you think there will ever be a security flaw within the implementation of the Zip encryption or early versions of Electrum?
That is very doubtful. Both Electrum and the Zip Archiver use advanced encryption algorithms that are considered to be very secure. The biggest weakness in your setup is likely the password strength for both the Electrum wallet and the Zip archive. If you used weak or short passwords, those should be your primary focus for breaking the protection. But know that brute-forcing a password can take a lot of time and computer resources, depending on the password length and complexity. The more you remember about those passwords - length, any special characters, if you used any words or phrases, etc. - the better your chances. Every little detail helps, but there's no guarantee of success.
It largely depends on the amount of Bitcoin that the OP has in that wallet. Is it even worth dealing with it?
If you were to hire someone to brute force the zip archive and wallet file, it could cost them more than the amount of coins in the wallet. There is so much talk about hacking, that many people think that it is a simple matter and there are people who only need 10 minutes to break any password or locked file.