pronounceIt may seem dangerous to express oneself on the future of labour law, since it is widely considered to be in crisis by scholars of the field. There is no doubt that anyone attempting to predict the probable developments by presenting hypotheses regarding these developments runs the risk of making errors. Especially the impossibility to guarantee the relevancy of the chosen parameters and a correct evaluation of the nature of their relations could lead to erroneous predictions. The same applies when one has the ambition to pronounce oneself on the future of institutions, structures or procedures laid down in and protected by law.
The cited usage is relative uncommon today, so you may not find it in many free-access online dictionaries. It's definition #4 in the full (subscription-only) Oxford English Dictionary...
pronounce transitive (reflexive).
To utter or avow one's opinions or intentions; to declare oneself.
That's to say, in OP's context the reference is to people who intend to make public pronouncements (say what they think, make recommendations) about things like the future of institutions, structures or procedures laid down in and protected by law.
I think the easiest way to understand pronounce here is as an exact synonym of declare. But avoid using it yourself, because many people would think your phrasing was at the very least "odd".