Hi Loïc,
( My name's Sophie and I'm French living in the US too ).
Of course you can get dual citizenship.
French citizenship can not be revoked.
How long have you been married to your USC wife ? => you can get a GC through her after about a year, and US citizenship after about 3.
You mentioned you arrived in the US when you were 6, so I guess you already are a LPR.
A LPR can apply for USC usually after 5 years.
Take a look at:
http://uscis.gov/graphics/services/natz/guide.htm
Hope thsi helps !