A problem with commander bans compared to other games is that there are several commanders with overlapping abilities. For example if someone wants to ban Osttruppen they'd have to waste 2 of their bans because there are 2 Osttruppen commanders. Another small problem is the fact that WFA only have 9 commanders each while EFA have about 20 each. But yeah commander bans could easily be explored in some fun/ML tourneys to set up a proper and fair system.
This is why we employed more complicated solutions with ML2 and ML4 in Jan. It's not that easy!