I just see the whole thing more in terms of English today than someone specifically "locking up" the Bible. Just as someone can't get around knowing English if he or she wants to pursue a career in science, technology, computers, medicine, aviation, etc. the same was true of Latin. It was the international language of academia, law and sciences in the west.
Those who used Latin could read Latin bibles if they wanted to (chances are they were available at universities).
I am only pointing to the factors that created the "lockup" as something that evolved, as not as a conspiracy, but a trend that happened before and has happened since in different time with different languages, and is happening right now.
When colleges for average people were started (by christians) in the United States it shook the world,.. And many others started doing it... slowly of course
Because the US grew increasingly more influential in the world.
By this logic, we should have a 100% college minimum compulsory education for everyone, incluidng the homeless, or just to flip hamburgers in the near-by fast food joint.
By the next century at least a masters will be required and by the century after that a PhD. What's the point? It's just artificially created education-inflation for profit.
I have years of education and I don't use but a tiny fraction of it in my profession. Most of it just looks good on my walls.
This system of (over)education doesn't necessarily produce smarter people. It doesn't necessarily produce better people just because they can read the Bible (assuming they read it correctly, which is unlikely). There is so much to know, no one individual can digest it all, so ignorance rules more than ever.
Besides, it makes no difference if those who couldn't read the Bible can read it now. The Reformed believe that they have either been saved or damned before they were even born and nothing in this world can change that.
Its possible you may not have a clue what drives the reformed.. The reformed run the gamut from salvation by works(various types(Armenian)) to salvation by faith(various types(Calvinist, more or less))..
Roman Catholic and EO (and others) seem to be Arminianists...
Working their way to heaven.. A hard job if you can get it..
I am of course neither..