Just let the EU be a Free Trade Club.
That doesn't work (
rough outline).
Write up a whole heap of EU standards, and let the market decide what standards are useful. e.g. If you want to stamp your widgets with the EU mark of quality, then your widgets must meet the EU standard, and presumably they'll command a higher price in the marketplace, at the same time don't stop the trade in widgets that don't bear the EU quality mark. Leave minimum standards down to member states.
If here you refer to engineering standards, business is much better off with common standards; it lowers costs via volume. One of the things businesses
love about any common market is just that. Standards.
Setup a system whereby law abiding EU citizens can move freely between EU countries, but don't have the right to settle permanently in them automatically. Let member states decide how and how long they let desirable migrants stay.
This, in my view, indicates that you possibly conceive of nationality in native-born and/or ethnic terms. The more
commerce-enabling and enlightened alternative, in my view, is to allow anyone who has arrived legally, acts legally, pays taxes when able (but is not immune to unemployment), and shares common values relating to democracy and human rights who wishes, after a prudent time, to seek permanent residence. This second view makes an immigrant just another voice in a compatible chorus. More profoundly, if one recognizes that each human is equal, then one can immediately understand that, say, someone who has started a family and taken up a mortgage needs a legal foundation to protect family and assets. Just another bloke.
Those who might be unwelcome are only those who commit criminal acts, or would deny or limit for others the same rights they claim for themselves (Art 54 European Charter), or would commit acts of treason/sabotage against the state (foreign agents/terrorists).
I'd change the Euro to an optional currency and make it legal tender for cross EU transactions. So if you want to buy widgets from France you can pay in Euros or in Francs. Actual currency union is doomed to fail unless there is one central institution setting fiscal policy and monetary policy for everyone. (see Greece) The Euro in this idealised EU is just a convenient way to pay for goods and services, nothing more.
See above, first point.
There are indeed many faults in the EU, big and small. Yet it's a common project, something that is frightfully difficult to ever get started. Taking on 28 (27) nations is perhaps too much, too fast, so a two-speed EU with a euro core and periphery makes some sense. Yet the rationale of taking on countries in the Eastern block is the same as the original one for the EU: to unite what otherwise has and can be a continent at war. In the meantime, also create a progressively more wealthy and healthy society within resource constraints.
Brexit has made that war more possible, as a blow has been struck, loudly, in favor of ethnicity as the backbone of freedom and community both. Add some demagogues and economic uncertainty, and we suddenly find ourselves in the early-mid 20th century. This may explain the strong feelings expressed on occasion.
Every time I hear Farage or a Tory leader speak now, I'd leap out of my chair and punch him out (ladies excepted; they get a bronx cheer). [Not a declaration of real or actionable intent.]