by Stovo
I've played many 3 player and a couple 4 player games and no one has been eliminated. Usually it is because of two reasons1) It counts as a battle to attack a home realm even if empty so unless you have the cards you must commit at least 3 attacks (2 years) And this is assuming it is worth it to do so (player has runes in home realm)
2) Expanding on number 1 is the fact there are usually easier runes on the board that you can take and hold from possible contenders.
Runewars is about tearing people down as much as it is building yourself up, so to beat up on someone who is all but defeated usually doesn't help you defeat the other players.
That is just my observation.