Countries will have finally worked together to have a more united Europe that shows as one front where countries still have their cultural traits and values, but Europe shows as one front on the political, defence, and economical standpoint.
Many policies would have been implemented for an improved lifestyle, especially around ecology/environment for a more sustainable planet, but also around alimentation where fairer wages are paid to local producers and farmers, and consumers have access to better, more sustainable products that are good for their health and the environment, with less chemicals, political corrupted shenanigans around what is available and less third parties taking commissions.

Because of its political and economical strength, Europe will be able to help better in the long-term less developed countries in providing a fairer and long-term access to basic necessities, education and health.