Absolutely.
The government has rightly made a significant shift, a mea culpa for recent decades, and it should be commended for doing so. However, I'm afraid that overly confining that message to the preamble offers the judiciary a blank cheque for interpretation. I'm afraid that a mechanism the government can use to do many things, such as make regulations and perform other administrative acts, may result in a confirmed preference for slow change that might meet with resistance elsewhere.
Consequently, it's worthwhile to take the time to formalize matters in the provisions of the act a little more clearly so we're better equipped to bear the consequences. It's like looking for a backdoor exit. I understand that the government needs flexibility and that the courts require room to manoeuvre, but it's also the legislator's role to have the clearest and most unambiguous will possible.
But let's not delude ourselves here. The ability of public authorities, the government and the legislator to slow the decline of French, which is statistically strong, is quite limited. If it's also paired with a weak will, the chances of doing so will be even worse.