On a vaguely related note (and here because this thread has attention and I cbf making one myself right now), the way we get IP/EXP needs to be reworked. The public knowledge that this caps at the five minute mark leads to some adverse behaviors (which ARE relevant to the thread), including but not limited to the following: conceding immediately vs certain decks thought to be slower (DoD and/or Verore come to mind), conceding after the five minutes is up, playing dead for the first few minutes for the sole (and largely irrational) purpose of bumping up the time, etc.
The first of my examples is probably the most important one - certain decks and/or factions just take longer to do anything useful with. Some people don't want to play against them because they drag the match out, creating both a boring AND an inefficient match, the latter referring to lost potential IP/EXP past the five minute mark. On the other side of things, some people don't want to use the decks themselves for the same reasons, PLUS the possibility of causing people to concede quickly or rage at them or similar.
My main idea is to have IP/EXP gains start to slow down after the first few minutes rather than cap. Something like 150IP for the first five and 75 or 50IP for the next five and so on (with comparable amounts for EXP). It could either scale down linearly or just plateau at something like 5 or 10IP per extra minute. Its not as efficient as two back-to-back five minute matches, and not even worth trying to abuse, but its way better if you're the DoD player who needs an entire 20 minutes to finish a match.
Giving players a meaningful incentive to play longer matches also helps alleviate the long queue times some of us have to put up with, and could be a step towards removing some of the auto-concessions under discussion. People can play decks that take longer if they're being forced to sit in longer queues, and the people they get matched with won't immediately leave the game because of it. People can identify their opponent's deck as an Exile/DoD/Cov stall deck and say 'well this will take forever but at least it will get a decent amount of IP' - rather than 'no way am I sitting in here for 15 minutes to get 150IP when I could concede and queue for two matches vs faster decks'.