as much as i don't like campers and i hate the living soul of their play honestly its a part of the game and i don't feel like making this game somekind of arena battle would do the trick , i believe that the only change needed is the removal of tier demotion protection, then people hitting a certain rank would either demote to where their skill is at not creating problems for people that can climb or just go for pubs (where there should be no sbmm according to their own statistics..) .
The counter argument here what i usually hear is but wait people will demote willingly just to feed their ego .. ok on that point there wouldn't be that many people that can demote to do that if sbmm wasn't a thing (5% of people are diamond + so to say that sbmm helps the 95% that would have a 5% chance of getting a pubstomper in their lobby is just ridiculous..)
Second argument would be but there are not enough players and this would make so many not play ranked at all since they can't climb , i believe they said this game has millions of players weekly so honestly if the ranked players drop from 3million to 2 million i believe that wouldn't create any problems, also I don't think that would happen , I think it would incentivize players to improve more and more.
Third argument i get is "Bro if i demote from plat 4 i will quit this game" well to be honest I don't believe the people that say that, they will most certainly not quit but if they do.... i think that maybe its a good thing, getting rid of a few toxic players create a great community that can have constructive criticism and not only moaning about things.