I've been interviewing a bunch of battery commanders and FOO/JTACs who had deployed to Afghanistan and quite frankly I'm amazed at how complex the job has gotten from my Cold warrior days. Firstly there is a herd of complex equipment from the LAV OPV itself to a whole new generation of comms and sensor gear. More importantly though the skills and teamwork needed in coordinating everything from a multitude of new munitions as well as air, aviation and Predator resources in a crowded airspace and a multitude of widely dispersed mounted and dismounted elements on the ground is much more complex even in what was a relatively low intensity combat zone.
It's one thing to say "put the round there" its quite another to have a high level of understanding what will happen once it gets there. Splinters do not distribute themselves evenly - they are very dependent on the line gun-target, and the angle of decent something your average assistant squad leader will have no knowledge or experience with. That's just one very small issue.
With the loss of the mortar platoon and the bn FSCC and MFCs, the artillery had to step up and, while reducing guns, it significantly increased the FSCCs and FOO/JTACs in the CF. Keeping them trained and qualified and, in the case of JTACs - recertified, is a major job that we are not keeping up with as well as we should. There are very significant training requirements and retraining requirements and for the most part FOO/JTAC NCOs are pretty much their own career stream these days while FOOs themselves are still a short term (roughly two year) assignment for officers on the artillery
cursus honorum. Right now the artillery is established for 9 x FSCC crews and 27 x FOO/JTAC teams - that's basically 9 x battle groups of three sub units each which is enough to provide rotations for one or two battlegroups but not the whole force if you count in the armoured regiments as manoeuvre elements. It's getting very tough for Res F FOOs to do anything beyond the most basic dismounted fire support operations and even harder for Res F battery commanders to be able to provide the full scope of FSCC support needed with the limited training that they have.
All that said to point out that while I dearly love every supported arms guy to be able to do calls for fire (and they certainly did in Afghanistan), the complexity of what constitutes indirect fire support these days (and even more complex once we add loitering munitions and such into the mix) is such that there will, in all probability, be no more moving down the chain. The supported arms call for fire will probably continue much the same way it does now and be much more accurate for target location than it used to be (as will the corresponding rounds delivered much more precisely) but there will continue to be the need for a very highly trained "interpreter/support manager" as between the caller and the appropriate delivery system. (As an aside I'm not sure of the state of the return of mortars to the infantry at this time)