Heroes of the Storm and League aren't that different in demographics

http://us.battle.net/heroes/en/blog/19883523/party-size-changes-for-hero-league-9-2-2015

When we look at the data for parties of three and four players in Hero League, we often see large skill gaps among party members. This is fine for players in a party of four, for example, who have agreed to queue together despite any differences in skill that may exist. However, the matchmaker needs to complete the team by pulling in a fifth player who queued up alone, and did not necessarily want to play with teammates of varying skill levels.

This can also create situations in which party members will discuss strategy with each other, but don’t end up communicating the game plan to their fifth teammate. On the other end of the spectrum, solo players may disagree with the party’s decisions, or show unwillingness to help the team. This can result in a friction for both sides if communication doesn’t improve.

What’s more, parties of three and four players appear in Hero League queues far less often than solo players and parties of two. As such we feel that large parties represent a small enough portion of Ranked games that we’re comfortable removing them from Hero League in order to improve overall match quality.

Can riot come out and admit what we know already about solo/duo being the majority of players in ranked? there's no need to ruin it for us by tossing a curve ball 3 man or 4 man premade - never mind that they're such a small portion of the ranked playerbase that you cannot guarantee pitting 4 man premades against 4 man premades (i've seen far to many 4 man premades vs 1 set of duos).

Since dynamic queue being introduced was Riot following Blizzard's example they ought to continue following blizzard's example and return solo/duo queue.