The plan was to raise the limit as the block size, from genuine usage, came up against it. The problem is that it requires a hard fork to raise the limit, so there needed to be near-unanimous agreement to go through with it.
While the vast majority of people in the Bitcoin space wanted to follow through with raising the limit, a small but dedicated group worked to undermine the efforts to reach a consensus. This article, published in 2015, provides a window into the politics surrounding the issue, and how the block size limit increase was ultimately sabotaged: