I think it's conceivable for well funded militaries to restructure equipment and doctrine for combat rolls to cater to lower performance standards. Reality however is infantry are carrying more than ever and performance is biasing more towards athleticism. GWOT has increased reliance for SOF units, and when millions are being sunk into each individual operator, you want to get your money's worth. Not to mention the amount of resources expended to service casualties both in field and in civilian life, for perpetuity. I'm sure some bean counter has done the actuarial accounting, and it's really up to society to decide if equality is worth the cost, which will be massive since it involves a whole of military effort considering every piece of equipment was designed for male performance curve in mind, i.e. F35 ejection seats isn't designed for pilots under 140lbs.