It would be stupid to get rid of the guns. Yes we haven't used them in anger since 'Nam but they are an integral part of the Army TOE. Yes the ACF needs to return but returning it at the expense of the guns is just as idiotic as getting rid of the ACF in the first place. Yes maybe 155's would be good, but I think that 105's are a gun that is not to heavy for a light infantry army and it's not too light to deal with most threats. My own view is that we should have a mix of 105 mm SPG's and towed arty.
Shame that there isn't a land based variant of the 5 in / 127 mm naval gun that was reasonably light and portable.
Oh I'm not suggesting to get rid of artillery, just like I did not support getting rid of the fast jets but I am just pointing out that when push came to shove come replacement/upgrade time and when the costs began to boggle the beans they did'nt reach for the chequebook they instead got out the axe, justification, lack of use, changing operating enviro, other priorities blah blah blah, it's not that I don't support the capability per se more I don't feel the capability support from those that really make the final Ds, I fully understand how defence is always left wanting at the politicians whims. TBH though if I did have to choose between an ACF and Artillery then actually for what we do and have done post "nam" and what could be meaningfully offered operationally to our allies (ie in Bosnia, Timor, Afghan etc) then I would still probably go ACF as warfighting has evolved, conventional is not so conventional anymore and bar WWIII not sure it ever will be either, not for us anyway.
These are times where for combat capabilities unless they have some kind of generic/humanitarian/ally crossover use then bar perhaps some baseline mods and upgrades to keep a minimal relevance (more for safety than anything else) then they are always next in line for possible downgrade/downsize/mothball or even downright termination. All that is required to trigger the expert formal reccomendation from whichever former "expert" is the next financial crisis, critical manning, funding shortfall, public outcry or even just simply replacement time and voila, millions "saved" and the sharp end apparently sharpened or pointy in a different direction at least.
The P8s where a good tick in the box $$$ wise but again they have the saving grace of other sells besides just hunting submarines which all adds up, the next big litmus I reckon will be the LAVs and then the frigate replacement in terms of level of upgrade and/or replacement to really gauge our future intent and alot can (perhaps needs to) happen between now and then both here and around the world to influence.