That's how I would possibly have imagined it as well.
Although it would seem bizarre to have two "separate" trade groups working alongside each other in mutual support but with completely different career structures and routes, and I'm not talking TG12.
Effectively that's what we have now in all but name.
It could also go the complete amalgamation route, all Controllers and Ops under one umbrella but with differing career structures. The disciplines, whilst different in some ways, are not incompatible.
We already have variety in TG9 controlling when you think of Area, Terminal and Range disciplines. With the existing training structures it should be conceivable to be able to add Battlespace Mangaement in as well.
Either way, if there was a "merging" of the Trades, it does call into question the viability of DE SNCOs.
I imagine recruitment for ATC would be helped with the addition of FCs, and as far as I am aware, they have no recruitment and retention problems (compared to us in the recent past anyway). We could almost go back to the old system, opening the doors again to greater promotion prospects and a wider working background for SACs.
Actually thinking about it, in many ways I don't think it would be an altogether bad idea.