Please do tell how nulcear weapons are being abused? And yes, I have fought in nuclear wars and I have been nuke rogued so I do know how it feels to be nuked. Do you really want wars do be more or less minimally damaging just because you happen to tripple team someone? Why shouldn't someone who has prepared their defenses to the max be able to severely damage someone who wants to take them down?
None of the new wonders are anyway near as effective as the SDI. The pentagon, for example, gives you a 10 % boost in ground attacks and the SDI gives you 60 % chance of shooting down nukes.