The EEC was a legal mess. It was the result of too many subsequent small changes that were adding up in a non coherent way.
The Lisbon treaty was long overdue and it did manage to improve how the EU works.
Now that the UK is gone, we should further perfect it. The UK has always been a detractor of any real initiative to improve peaceful coexistence of continental EU states. Acknowledging that without them we can better work together would be a huge step forward.
What people don't get here ironically is that every bureaucracy's purpose is to get bigger and gain more power at the expense of the people they rule over. Nobody learned anything from the USSR fiasco. These kind of supra national governments never work on the long run. Europeans are too different.
In France, already governed by a fairly conservative and authoritarian government, the far right is at the doorstep of power and banking on the relatively successful brexit.