I don't know that the liberal arts curriculum is going away anytime soon. Sure, traditional liberal arts degrees like philosophy or the humanities are under unfortunate pressure that may be unwarranted. For instance, many Chronicle of Higher Ed articles identify correlations between a liberal arts degree and lifetime income as well as valued work skills that go beyond the current trendy tech skill fads. Moreover, liberal arts curricula tend to be alive and well in the CC and state college/university systems where the freshman and sophomore core tends to be parallel what's expected at most SLACs. I rather suspect the pressures on SLACs are less curriculum related and more reflect changing demographics.
Over the next decade or two, the main increase in college-seeking student populations should be those who are non-white (especially Latino) and first-generation. Such students may be less aware of how things like tuition work and may well avoid private SLACs for the poor job they do advertising real tuition as opposed to the inflated pre-discount rates touted on their websites. For a first-generation student of modest backgrounds, a $30,000/year SLAC can instantly be off the application list versus an $8,000/year public university.
As for tenure, it's still present at many state run 4-year colleges and non-R1 universities, although yes it is not as prolific as it once was. Even R1s are starting to take on more multi-year contractual staff over tenure-track faculty. That said, depending on the state, such positions can be fantastic offering solid promotion opportunities that parallel the tenure rank system, funding for professional development, and even some opportunity for research. Of course, such positions don't often have "tenure," though I'd point out tenure itself isn't as permanent as it seems. Annual reviews and various administrative policy specified in faculty handbooks can allow higher ups to terminate even tenured faculty for various reasons. And, this does happen.
My best advice is to seek the best match job for your starting career and then work to cultivate solid teaching, high-quality research, and try to win external funding. If you can do much of this well, you should have a bright future in academia - tenure-track or not.