Maybe it was never really about content. I hope that isn't true, but we have to consider the possibility. If you wanted to set up a system that rewarded content purely on the basis of quality, would you create steemit as we see it today?
I like to think that steemit's ability to attract new users is based on quality content, but when I look at other social media, that strikes me as a little naive.
As for your situation, that's your call. But I'd be sad if the number of people here who actually cared about content, including yourself, dwindled away - because you are right, when that happens, steemit will stagnate, and there won't be any point in being here - not for me at least.
Quality is subjective, and yes, in the early days a lot of SP was devoted to upvoting content people liked. Now, most of it is self-voting, renting to random people, vote buying services, etc. So, yes, it was about content when first imagined.