The reason why solo and dynamic queue can't co-exist
Dynamic queue cause worse experience for SOLO players, that is obvious.
If solo queue is out, nearly all of the SOLO players will be playing solo queue because it provides better game experience for SOLO players.
And without SOLO players, the casual PREMADEs in dynamic queue will never find a match. It's that simple.
SOLO player is the glue that keeps dynamic queue together, yet all recent changes and rewards such as the hextech crafting system is encourging people to play as PREMADEs. If rito really want to keep dynamic queue the SOLO players' experiences will need huge improvement. Altho playing with 3-4 man PREMADEs will never become pleasing for SOLO players and it will not nearly match what SOLO players get from solo queue.
RIOT PLZ