The same level would be fine but it is either the top of the hill or the beginning of the downslope.
The EU made several critical mistakes in the way they approached their growth and integration issues and those in turn could very well lead to a final desintegration or split of the bloc. The UK leaving is a very bad sign, given that they already had one of the most exceptional positions within the EU.
Time will tell.
Of course the integration 'by force' (Maastricht for one, Lisbon for another) was utterly dumb, it feels to me as though they thought 'now or never' not realizing that they may be planting the seeds for the eventual dismantling of the union.