The problem is that they're coming at this from the complete ass backwards direction. The ability to declare wars on anyone isn't the problem (though there should be a limit on how many wars you can have active at once), it's the lack of means for a decced corp to work towards ending the war and earning a reprieve.
And shit about structures should not have anything to do with any solution. If you make it so a corp has to have a structure to be decced, that just leaves industry corps the primary victims still, still leaves those victims without any means of working towards an end to the war or a reprieve, encourages people to put structures in offshore alt corps, and creates a situation where you're inclined to leave their structures standing so you maintain the ability to prosecute wars against them (IE we leave Nauplius's citadels up so we can actually war him). If you go at the other way people have suggested, of making the attacker have to put up a structure, then all you do is balance decs around who has the most numbers (IE, professional dec corps won't have any issue defending their own structures from the newbies they war). Structures are not a good solution to war decs in any way.
It's also a complete misreading of the statistic. The KPW values only say that corps with structures are more active than corps without structures. It doesn't say whether or not they actually want or try to fight back, how many of them have been destroyed by the fighting (RP examples: Sanxing or KSCS), and so on. Of course there will be less kills per war with decs on non-structure corps, because of how many of those corps are alt or social corps, how many are filled with inactives, etc.
And the big worry here with the bandaid is that: A) The actual system takes far too long to be implemented, or is even dropped, a common thing with CCP, or B) The actual system still includes the structure requirement as part of it. It also reflects the way their thinking is leaning towards: making the fix related to structures somehow.