The options:
1) Relinquish US Citizenship - unlikely available since born a dual national (?) but did not relinquish at 18 years of age and instead has a US passport which was used to allow work in the US for a period of time after 18. There remains a cost of $2,350 (currently) even if possible.
2) Renunciation with compliance - Become compliant (5 years) and then renounce according to guidelines thus avoiding "covered expatriate" status. Minimum cost of $2,350 (currently) plus any cost associated with becoming compliant.
3) Renunciation without compliance - US citizenship can be renounced, and is not dependent on becoming US tax compliant, but leaves the individual with "covered expatriate" status. Minimal cost is $2,350, but covered status will remain forever with possible consequences.
4) Full US tax compliance with the intention to carry forward US citizenship leaving the ability to travel/work/live in the US in future. Cost will be any associated with becoming compliant.
5) Continue to be non-compliant. (See LionHeart post above - reply #2)
Only the individual can/should decide after much research and thorough consideration of the options. The overriding decision is "does the individual ever intend to return to the US permanently in the future?".
6) The French Senate and the EU Commission have both questioned the treatment of accidental Americans as well as dual US/EU citizens. This creates a certain amount of pressure on the US but it is unlikely - at present - to alter US taxation of its citizens living in the EU. Only the US can change how it taxes its citizens, and neither France nor the EU can change that. (See 8 below)
7) There may be, by the end of June 2018, proposed legislation in the US to change the basics of taxation of US citizens resident abroad. It may cover special treatment of accidental Americans - but more likely it will propose reduced reporting/compliance yet retaining some degree of both. We'll have to wait to see the actual Bill, if such a Bill is put before Congress. Proposing legislation changes nothing until it is passed, and at some point in the future it could be abolished (thanks to US two party war politics). We'll have to wait to see the actual Bill put before Congress.
8 ) The current US/EU "trade war" may escalate. The EU is unhappy with the degree of reciprocity promised by the FATCA IGAs. If the trade war were to expand to other areas besides commercial products, an EU dictate for all EU countries to cease all FATCA reporting could result. This is real conspiracy/fake news/wishful thinking, but who knows?