Full nodes can't force the miners to do anything. But full nodes (and their users) can reject anything the miners do.

In your scenario, the miners will be working away on their invalid blockchain, but the valid blockchain will stop growing. At that point all it takes in one miner doing CPU mining on an old Celeron to resume growing the valid blockchain. It may take several difficulty adjustment periods before the single miner can produce a block on schedule, but valid transactions will eventually resume. Meanwhile, the rogue miners will be unable to turn their BogusCoins into value.