what if certain summoner spells were mutually exclusive, like runes?
mobility: 
(lets say there was a version of snowball on summoners rift)
defense: 
offense: 
(well, there arent any more but could be. lets imagine surge was here)
utility: 
and lets say, fortify or promote.
and you can only chose one out of each category.
maybe this would allow riot to buff certain summoner spells like or introduce new summoner spells like to bring them up to par and not make flash the only mandatory choice.
since picking would have the opportunity cost of not picking .
maybe this would finally balance summoner spells in a way, that not every single champion has to take flash every single game, without just making the combination of flash + whatever new or buffed summoner mandatory.
so if we buffed we wouldnt have every mid laner run , but some of them might actually pick rather one over the other.
if we introduced then some champions may run it in place of flash, instead of making both of them meta on every champion.
