An interesting proposal!
Remember back in season 2 or 3 (i forgot which exactly) We used have a really cool feature between masteries and summoner spells! http://leagueoflegends.wikia.com/wiki/Summoner%27s_Wrath_(Season_Three_Mastery) like this! or this one http://leagueoflegends.wikia.com/wiki/Summoner%27s_Resolve_(Season_Three_Mastery). +5 health per level if you took a point in summoner's resolve? that was awesome! or even the old utility tree! http://leagueoflegends.wikia.com/wiki/Summoner%27s_Insight_(Season_Three_Mastery). So I feel like this actually gave us a bit more diversity in summoner spells as well as mastery trees! Why did they get rid of this entirely of just tweaking it? Now I think it'd be awesome if we made mastery trees more unique perhaps by giving added bonuses to putting 21 points in a specific tree. We could either make it champion specific or role specific. If it were to be done by champion specific? Well we could give each champion three optional passives (only one being able to be active as you can only put 21 points into one mastery tree at a time.) What would they be? not a clue but I just know that it would add to the diversity riot says they're working towards! Champions could become viable in all mastery trees! However you wanted to play that champion you could! It would even have a new passive to justify playing it that way! Please give me your feed back, would we like more diversity in this game? you know more than just im an ad champ lemme go 21/9 or im a tank let me go 9/21... It's so redundant! Thanks for your feed back my friends =]