Quinn can go adc, she was designed for that role. She simply goes top lane because it's easy to poke someone who can't poke her back.
Quinn is a terrible ADC. She can go ADC like Jayce can go ADC.
It's natural to have some ranged anti-melee champions, and for melee players to complain about them. Quinn really suffers against opposing ranged champions in lane, though. Her laning profile is reasonably balanced; see if you can get your mid laner to swap you if you get counterpicked by her.
Same with many mid laners like Lissandra. Lissandra on the hands of a good player is really tough to deal with.
But she doesn't go mid, she goes top because, again, it's safer to poke someone who can't poke you back.
Lissandra hates playing mid. Just like Quinn, she's naturally an anti-melee ranged champion and loses to most ranged champions in lane.
Top lane has always been the lane were bruisers fought each other, but everything changed when the Ranged Meta Attacked.
I think that top lane = bruiser, and mid = mage, was a bad thing about season 2. I would much prefer to see a game where there are members of each class of champions that can go in each role, so we have more strategic diversity. That is mostly happening these days - there are some mid lane fighters, jungle assassins, top lane mages, etc. We're not all the way there yet; in particular we have a problem where immobile melee champs mostly suck. I like this better than always bruiser top, always mage mid, always ADC/support bot. Way too stagnant.
Now they can't go top because they are 100% jungle reliant. They can't jungle because most of them don't have any sustain and the new jungle is brutal for those sort of champions. They can't mid because they be outclassed by another ranged champion.
Every class goes through ebbs and flows. At the start of the season, bruisers were crazy good. At the end of season 4, they were pretty weak. I don't have a good read on the preseason balance, so I'll refrain from commenting there.
In the event that your story of bruisers being banished from the game comes true, it will be fixed. Riot isn't going to leave 1/3 of the champions on their roster out of the game for long.
And if they are sadistic enough, they can go bot to get poked down by a Caitlyn Morgana.
Morg Cait is a terrible lane to take against bruisers. Need more damage and mobility. Morg excels at solving mages, not sustained damage stuff. I would expect a Jarvan/Pantheon sort of thing to beat that lane.