I can maybe shed a wee bit of light here
But this is very much my own hypothesis based on what I've read and putting 2+2 together - this is
not printed in black and white (well, not yet....).
Firstly the Salmon Fishery Boards will most probably change comprehensively in their make up as, for the first time, it becomes a river basin and all the fishes contained within plus area habitat that they will be responsible for. This requires a dramatic change in most cases, on how things are done are at the moment. I forsee a lot of Salmon Fishery Boards becoming River Fisheries Trusts as the first step in incorporating the new initiatives into local management of fisheries.
It's logical to assume there will be a gradual overhaul of all fisheries law in Scotland within a decade.
Secondly the levy currently raised on proprietors of Trout & Salmon fishing will remain as this provides for local costs (bailiffs/managers/hatcheries etc). Proprietors of Trout fishing are just as liable for levy/fee raising (albeit not excessive amounts) particularly where a protection order is in exsistence so it's all encompassing. Monies raised centrally by a rod licence would supplement local initiatives.
Thirdly - and this is where it gets interesting...... a rod licence within Scotland would have to be national and managed centrally, most probably from Edinburgh. The framework rightly points out that fisheries management in Scotland needs to "raise its game" in most cases, caertainly the fractured approach we currently "enjoy" is a cause of frustration for many. It is logical to asume that a rod licence would, in part, serve as a vehicle for the collection of a pool of money to be distributed equally on an annual basis to the river/loch trusts. Ultimately I see that it would be paying for something similar to the way the old NRA worked on a regioanl basis in England and Wales prior to the creation of the EA. I imagine that SEPAs role will change as they will be seen as the competent body to deal with certain enforcement issues. I'm not entirely sure I back that move 100% myself but let's wait and see if I'm right - I'm not saying this will happen, it's how I see things developing.
I'll maybe come back to this later, but right now I need a coffee