MUC would be interesting as it is an LH hub. TUIFly and AB already have a base, but those are leisure flights, not offered by LH, or former dba flights that LH has had as competition for ages.
But if Easyjet went into MUC it would likely involve large scale competition on LH business markets - more than just STN. If EZY started say MAD, CDG, MXP, AMS and VIE, I doubt LH would not respond. But would Easyjet be able to withstand this?
MUC would be high risk (far higher risk than expanding against a weak AZ at MXP for example) but the reward could be big in gaining market share on key business destinations out of Munich