You make a very good point TC.
Quite frankly, soloQ. In my humble opinion, being a support in a premade sandwich is the most cancerous thing in the world, because unless the ADC is also solo, 9/10 you will get blamed and shit on by the butt-buddy club for all the ADC's mistakes and I frankly can't deal with that BS. What's worse is in premades, the adc is less likely to communicate or play in sync with you. It's horrible.
My issue with premades has rarely been the enemy team but my own. Being the filling is disgusting.
And as a general rule, i think you will find that unless the support player is in a premade themselves, they will probably go to SoloQ as well, assuming it has duos as well like the old system still. Because at least they can pair with their ADC friend.
Quite honestly, DQ doing that was dimply a mistake. I understand this is a team game and the agenda Riot was trying to push, and agree with it, but ultimately, DQ didn't even really adress that issue with ranked, it must mutated it into something else.
If League is meant to be played as a team that way, then it should BE the 5v5 both teams are premade with communication set up, not forcing people to fill in their groups of preset assholes.