Physical domination was relevant thousands of years ago: it is not relevant now.
It could become relevant again at any time.
Look at the attacks on women now. What if all men were wife beaters ? What if all men raped at will ? I don't see women being able to stop it now, even with the help of the legal system.
The only thing that protects you, is that only a small percentage of men practice such behavior. You and all women would be in grave jeopardy should men in mass decided to revert to such detestable behavior.
You will have to do a little paradigm shift it seems. However, to address your points: the idea of physical strength being needed to hold on to or regain power is moot (having little or no practical relevance). Females can operate mechanical power as well as men. Your argument is based on an archiac way of seeing the world, and, I suspect, a great deal of intentional blindness and desperation.
No desperation whatsoever, I'm just laying out the facts for you.
Take Afghanistan for instance. Archaic yes, but the bottom line it's 2014 there as well.
As soon as America completely removes it's forces, the Taliban will once again take over. At least some regions anyway. They will suspend any rights women have gained, install curfews on women, and whatever else they wish, and there's nothing women can do about it outside of trying to get the hell out of there before this all comes down.
Now I know you will say, it's only because women have not advanced far enough in a place like Afghanistan in order to head off such draconian laws and such. That's the whole point, men have not allowed women to advance because they have 100% control of their destiny.
Women have advanced in this country from their own hard work, which includes pushing for changes in the law which give them more rights. Still though, it's only because men have agreed to it, and had they wished to prevent women from advancing, could have at any time done so.
Men could have simply not agreed to allow women to vote, owned property, or be in charge of anything significant.
Now you say women can operate mechanical power, and while this is obviously true, men can as well, and with their superior physical strength would take over such organized might as the military and police forces.
Now again, I cannot repeat enough that this would never happen here, and few would advocate for such a situation.
There would have to be a complete collapse of our society, and a central focus by men to be in charge of everything.