Yep, the left will be just fine. It's important to understand the long game here-- I get the feeling that most commentators/people completely miss the long game view of the current identity politics crowd, so I'm going to spell it out.

A bunch of crazies getting upset about the naming of various identities actually serves the cultural purpose of advancing various marginalized groups away from alienation a bit. The best example of this is how the blacks were able to move the name for their people away from outright epithets to progressively more acceptable alternatives. If a name for a people has a heavily pejorative meaning, changing that name to something else is for the better, and it's very hard for that to happen without any organized interference in the language.

Sensitivity to ultimate meaning and taking offense at progressively more subtle and perhaps eventually illusory meanings is essential to making this organized effort. It's also why the SJW crowd is perpetually agitated-- they are looking for subtleties which are incongruous with neutrality/positivity of meaning. Making new terms is a good tactic. It's important to understand that newly created terms are relatively blank slates as far as their associative baggage goes, for a time at least-- rehabilitation of a word such as "gay" is pretty tough, but once in a while it can happen in a generation.

Sure, the social justice crowd leaves their shrill stink upon ever newly generated name/gender/whatever, but the fact of the matter is that ten years from now we'll be glad that we can acknowledge people without having to to use a term which unintentionally puts them down. We wouldn't want to be calling disabled people "retarded", would we? Making that cultural change took time, but we're better off for it. Of course, there weren't SJWs screaming about that change being mandatory, but whatever, it was a change for the better. Maybe the screaming makes it go faster. Probably not, but it's what we get.

There is an important caveat. The idea of terminology changes being fueled by sensitivity to meaning is limited by the reality of the constructs whose name is being changed or created. This is best illustrated by a few of the more out-there gender constructs that are proposed as necessary to describe certain configurations of human sexuality. Does "verangender" (defined as a gender that seems to shift/change the moment it is identified according to http://genderfluidsupport.tumblr.com/gender/) actually exist as a gender construct that we can characterize, understand, and confirm objectively? Or is it an ill-defined illusion generated by over-abstraction of the subtle elements of previously confirmed constructs? I would say that by the end of this push for "social justice" (estimate: winding down by mid 2018) the exhaustive list of items to be outraged about and new terms to keep track of will be organically culled down to the identities which are "real". By "real" I mean coherently and consistently characterized and understood traits which correspond to a real group of people, rather than by mis-identification of overly abstract rubrics. Don't try bringing up this idea to an SJW, as they find the potential that people could mis-identify themselves based off of exposure to third party ideas as invalidating, insensitive, horrendous, and offensive.

I'm going to say that for the most part, the SJW crowd doesn't even understand this game plan or their part in it. They don't get the game plan; they're the pawns. They're addicted to self righteousness, and they have no ability to make their case logically to the unconvinced. They are only able to move forward one square, or attack the limited issues that are within their range. This is why they end up wasting so much energy protesting meaningless things like university heraldry or the like. It's no wonder why: the issues of race, money, and gender are more about emotion than logic or fact, and it's difficult to identify the proper roots to strike at.

In conclusion, it's the same story as usual: don't mind the boomers lamenting the energy of the young. The SJWs are cringeworthy, inconsistent, and overzealous, but on average they'll push things in the right direction against their best efforts.