A decay system is sorely needed and should affect everybody who participates in ranked PvP. It'd help ease the win trading epidemic somewhat and it'd also discourage people from rushing to get as high a rank as possible in the first week of a new season and then just not bothering to fight again. Queues are very fast early on in a season at almost every hour of the day but then the longer a season goes on the queue times become utterly ridiculous.