155mm is better represented by systems like PzH2000, M109A6 or Caesar than by the specialty gun M777.

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Let's wait for what happens about the DPICM / cluster / dumb submunitions / explosive cargo round ban in 2009.

Large calibres are less efficient for fragmentation effect per HE round weight than small calibres like 90-122mm and today also larger than necessary for guided munitions (which work fine in 120mm+ and probably already with 105mm+).

A loss of DPICM would badly degrade 155mm performance (and also 227mm performance) and might lead to smaller calibres at least for the towed gun role.

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I expect MRLs to turn into missile weapons (guided & long range - both easier with rockets than with shells).

My expectation for Netfires (or whatever is its current name) is that it'll be cancelled to save money.

I'm not so sure about the future of guns - inertia will likely keep 155mm the premier calibre, even though that probably won't be optimal.

Motars will stay what they are - albeit more often mounted than before.