When it comes to the labor force in America, their collective power in absence of strong and robust unions, that do the right thing by all of their constituents, grows ever weaker by the day. The most insidious of things that some employers do is essentially to create separate classes of workers, in which the favored class of laborers are full-time workers, with designated benefits, and some sort of secured employment. For them, life appears to be really good. However, for certain newly hired employees, or employees who are classified in jobs in which the skill level so needed is less, those same employers do not provide the same sort of benefits to these lesser employees, and additionally the job security so desired by them is nearly entirely absent. What has effectively happened is that the employer has deliberately created two classes of employees, those that are privileged and those that are not; of which, the privileged employees when it comes to their salary and the like, are often aligned and beholden to their employer, and pretty much as long as they are kept satisfied, they don't really concern themselves about that other separate and unequal class of employees.
So then, while there are all sorts of tricks of the trade of eliminating, breaking and eviscerating unions, certainly one of the more effective ones, is to divide and to conquer; in which thereby the employees that are considered to be of more material value, are treated differently, than those that are perceived to be more readily replaceable and therefore those privileged employees don't see the upside of being unionized. That is why it is so important for unions, when they represent workers, to represent well all of the workers, as opposed to only some of them, because once certain employees decide that they don't need or don't desire union representation because they find that cooperation with the boss is the apparent better deal for them, the balance of the workforce is pretty much left high and dry -- without power and without representation.
The bottom line is that employers are very savvy about doing what is best for them and their pocketbook, and if that means treating some employees in a manner in which they are disposable, underpaid, and replaceable, they are going to have a strong tendency to do exactly that; especially when there is no pushback from their core employees. The problem though for those that think they have it so good as an employee in the privileged class, is that employment needs as well as the changes in today's high-paced world are very fluid, and when it comes to the greed of employers, such is never satiated over the long term, but only in the short term, which means that all those employees that considered themselves to be "irreplaceable" today, may yet wake up to face a very rude day.
In short, when the employer has all of the power, and the labor force, has none, except for those that believe that they are essential; recognize this truth, that the most aggressive of employers see those that they employ as always being an expense, and therefore they are always looking for a way to lower those expenses, and they won't ever stop their relentless search to do that, because, for them, making more money always trumps a mere employee, every day of every week.