Yep, meat alternatives are probably not yet at a point where it could replace meat for those who don't want to go veg/ vegan but want to do more to help the environment. However, the more people choosing to go sans meat, at least in part, the more money, scientific endeavour and research will go into producing alternatives. Even in the last few years it has become much better. Personally, I don't eat many of the meat alternatives as they are so processed.
I managed to convince two of my friends to drop their meat eating in half by suggesting they spend the same amount of money on half the amount of meat, this buying higher quality and less processed crap. It's a step