On the other hand look at the UK. We used to have two parties (the Arseholes and the Bastards) and a small third one that never got in but always had a few people elected to parliament. Then last time around the two main ones balanced out so evenly that the smaller third one became king maker and formed a coalition with the Bastards.
Now we have another contender, the Closet Racists, who are making waves. We have an election in May and it will be interesting to see how well they do. It's entirely possible they may end up in a coalition with some power. A decade ago no-one would have dreamed of all this, now it's a reality.
Things can change, it's just not easy to engineer that change. In our case it was initially due to a very close election, and then due to grass roots support for the Closet Racists and a particularly charismatic/offensive leader. If you don't happen to be a Closet Racist don't worry, in other countries far left parties have got in too so it can go either way.
Don't give up hope, it can happen.