That's a pretty big "if," my friend. If optometry school cost a few thousand dollars, like it did in the 70s and 80s, you wouldn't be reading posts from me on this site. If someone could do 2 years of community college for next to nothing and then do an OD for 5 - 10K (like you could do 25 - 30 years ago), the ROI would be totally reasonable. Even with all the nonsense going on in the profession, it would be hard to argue against a profession that would pretty much guarantee an income in the 50s to 70s, and possibly up to the 80s or 90s, for that kind of investment. The reality is, the investment is not 5 - 10K for most, it's more like 200K, once undergrad is factored in, and higher for many. So, that "if," as it turns out....is everything.
Keep in mind that the "80-100K" figure (which is heavily weighted toward 80K) is the often-reported average for FT positions (getting more and more uncommon for new grads), which right now are mostly commercial. Full-time private practice positions, for those who are lucky enough to find one, are going to be looking at 60K to 80K as the range, with some outliers. In many graduating classes, particularly those in metro areas, the majority of new grads are not able to find FT positions so they assemble them, as best they can, by stringing together PT work.
I'd also add that if you're talking to OD residents at VA hospitals, you're hardly getting a cross section of ODs that represents the majority. Most OD residents in VAs practice full-scope optometry in a pretty nice setting, but they have no exposure to real world optometry. I have a number of VA residency-trained friends who have never worked at a FT job. These are some of the most highly-trained ODs out there and many of them are stringing together positions at various Walmarts and other commercial offices, with maybe a day or two per week in a private office.
Optometry might seem fine to the casual observer, but it isn't, and the best part is, there's pretty much a civil war going on within the profession, guaranteeing that nothing will be done to correct any of its real problems. Optometry will collapse in on itself like an exhausted star. It's not going to be pretty. Don't take my word for it, listen to the people who have done workforce studies. They have been warning of problems for over a decade. Read what they warn of now - pretty much saying that "the best is yet to come in the next few years as the new schools come online."