This world is largely governed by a basic law of Economics: Increase in supply leads to fall in price.
In terms of content writing this would be applicable as increase in the number of writers leads to rise in competition. With respect to rise in competition, there wouldn't be a similar rise in demand for content ( it's an assumption and well-observed one), which would lead to considerably less amount of work for writers. Less work, more writers would lead to desperation, as you can see on DP and Warrior forum. Desperation leads an individual to stoop at the level, which he/she would have never imagined in his/her worst dreams. In short, the price per article would fall considerably in future due to increase in competition. There's no market force or an agency, which controls pricing in the field of content writing, so everyone has right to offer services at any give price. Although it sucks, but it's a brutal fact and we have to accept it.
But, we must not forget that there's a league of writers who would be comparatively lesser impacted by this competition. This league includes writers offering elite quality articles. So, if you want to surpass the competition, then join this league. I remember Steven Covey saying 5% of Americans earn as much as the remaining 95% of Americans earn. He went on to prove his statement. Take for instance this forum. There are certain set of members who are not active on the forum generally, but end up earning 10-20 times than an average Blackhatter. It's simple maths. Competition is fairly higher at lower level, but as you raise your level, competition reduces.