Basically: The opinion access problem is not "largely solved". If it was, Google wouldn't be one of the folks fighting to get access to opinions, and I wouldn't be funding folks like Carl Malamud to do things like scan federal reporters (https://yeswescan.org/index.court.html, #22).
If your interest is in getting and providing bulk access to cases, then yes, you have obstacles. But that is only a problem for a select few individuals/companies who care about this as a business or hobby. The end users you may be trying to service by offering access to the cases can already get access to the cases from Google for free.
EDIT: To be clear, I'm not intending to downplay or diminish the efforts of you and others to open up access to those older cases. I think that is great. All I am saying is that for the vast majority of people, the vast majority of the time, there really isn't a problem in finding cases online.
Opening up PACER really doesn't help in practice because the data is ridiculously dirty - crappy scanned PDFs which people then pay to have triple keyed.