As long as the game engine includes real weapons, I am interested. If ArmA 3 doesn't come with M-16s, AK-47s and the conventional USA/Russian troops that use them, it offers nothing for me no matter how much the engine is improved. Sure modders can backfit the stuff I like and want, but when I buy a game, I prefer that it actually be something I like and want to play without relying on mods to give me what I like and want. I never played any of the campaigns. I liked single missions and preferred multiplayer with close friends on a home LAN. ArmA 2 is pretty cool, but the delivered missions (single and multiplayer) have never equaled the enjoyment I got from OFP/Resistance. The user made missions and addons for OFP have never really been equaled either. I still have 6 PCs that can run OFP for hosting LAN parties with my old friends. We always play certain stock missions and a few user made missions that we have never grown tired of playing and replaying. I have tried the mods that allow retrofitting OFP content into ArmA 2. It is cool, but not as cool as playing the original game. Give me all of the CWC/Resistance material upgraded to ArmA 2 or ArmA 3 standards, and I would be one happy camper. I am still waiting to see what ArmA 3 ultimately supports, but from what I see right now, this will be the first sim in the series I don't buy.
The problem is that it seems almost clear by now that there won't be any M-16s, AK-47s, M-4s, etc... Instead you will get all sorts of wierd weaponry such as TAR-21s, FN-2000s, etc... which seem to be used by both sides. I hope to be wrong regarding this but I strongly believe that I won't!
Therefore I completly agree with you and I even add that regarding mods that it will take YEARS before we have a complete set of present time or past weaponry and units for both sides if we rely on modders to deliver this and this if we ever get that from the modders. What I mean is that I'm pretty sure that we will see a modded M-16 in ArmA3 but a "lone" M-16 is almost usefull as NO modded M-16 at all -> We need all sorts of other weapons and units that will make the M-16 (or the AK) "usefull" and therefore that this weapon would make any sense in ArmA3.