Marksmen + support bot needs to be ended.
No other lane is so hindered in what is seen as acceptable as bot lane.
But every time the bot lane meta is seriously challenged what is challenging it gets nerfed or marksmen get buffed.
Mid and top see mages, fighters, assassins, tanks and even marksmen. Same goes for jungle.
Promote supports having an impact in any and every lane they chose to visit. Just make there be a drawback of them staying too long with nothing actually getting done.