Dynamic queue relies 100% on solo players to function.
That 4 man needs a solo player to fill.
These 2 duo's need a solo player to fill.
And that 3 man needs 2 solo players to fill at least half the time.
Meanwhile playing solo gives you a disadvantage and riot even made sure playing with a premade gets more rewards, on top of often being flamed at by premades or just being flat out ignored.
Its not fun for solo players it gives em a disadvantage on top of it, if soloq ever comes back thats where 99% of the solo players will go.
And because of that queue times increase to days if not weeks.
And the irony of it all is dynamic queue doesnt need a single premade to function, whilst promoting playing with a group it is 100% reliant on solo players,