IMP and others,
You then might find this article interesting as an example of where we're heading:
http://www.defense-update.com/produc...ps_291009.html
Survivability is turned into a big market area and I think this is why we're not seeing much in advancement of new models in MBTs, it's cheaper to tech up, gun up and increase protection on existing equipment. This is allowing for instance British MOD to plan for a service life increase of the WARRIOR until 2030. The M-60 with the packages available as I've posted for consideration for Don already, are looking at service life extensions of 15 to 20 more years. All this tech allows everyone to stay in the game longer especially during these economic times.
Pat