My proposal is simple. Choosing Ranked allows you to join a pre-game lobby with equal teams, just like what we see now, while choosing Quick Match inserts you into a regular Ranked match already in progress. This way the player base is not split into two, and the group that prefers each can benefit accordingly. Quick match players who enjoy jumping in games right away still can do so, and because the entirety of the player base is kept intact, default Ranked competition features a wide array of skill levels as opposed to now where Ranked matches are intimidating for many because of the hardcore players who seek it out. Meanwhile, those who like Ranked enjoy all of the same perks as before without having to spend several minutes searching for games - which was another (valid) complaint from QM players.
I think this is the perfect solution and keeps both sides happy. Thoughts?