1. Women own property and pay taxes. In the past that wasn’t always the case. Women used to be less educated then men, but that is no longer the case (probably a function of the fact most women now live to old age – most women died of complications from child birth).
2. Regardless of what we may feel, women can vote in almost all countries. In the first election held in Eretz Yisrael the hareidi women refused to vote. Had they vote, the hareidim probably would have been the largest block, and the history of Eretz Yisrael might not have veered off in the direction of the war the radical zionists were aiming for.
3. One of course could agrue that voting should be limited to the gedolei Torah, and that Baal ha-battim should be excluded (not to mention non-frum Jews and goyim), but that hardly works in a modern democratic (small “d”) age. And in Israel, many hilonim believe hareidim shouldn’t be allowed to vote, but that’s a different matter.