Not much for the future really.
Modding in shooters isn't as common as it used to be(well, PVP shooter-wise), especially client side stuff. UT3 was very sparse when it came to crosshair customization, and even custom keybinds had a tendency to require the INI to be set to read only to stick(still a thing in pretty much every UE3+ game I've played)
On top of that, crosshairs today are rarely just a PNG with a mask in an alpha channel for transparency, they tend to be in a large image of a mishmash of bits and pieces that get snipped out and placed by code.
So the future is... whatever devs decide to do. I'm going to advocate for high contrast crosshairs where I can, but until a dev decides to allow crosshair customization, that's all I can do.
Game on space cowboy
See You Space Cowboy...