A new commission can always change their mind and propose new laws that get voted in, as can any government. There is few things an elected body can't do, and even when there is safeguards then those can be removed given enough effort.
And this is not exclusive to them. Common law and to a degree Civil law are changeable in this way where a court can retroactively decide that things previously allowed were actually illegal by providing a mere "clarification".
In eu this mean several layers that can modify what a law actually mean. The government, the national courts, the EU parliament, and the EU court. In the US you got federal law, state law, city law?, and courts all the way to the supreme court, each which can in 10 years make a decision that retroactively decide that things previously allowed were actually illegal. It seems like a risk that is inherently part of the legal system everywhere.