User blog comment:Kirkburn/Technical Update: August 12, 2015/@comment-24473195-20150812214201/@comment-24473195-20150817133239

"Well, now that error reporting is back, people can now actually edit modules and be able to find their mistakes and learn rather than just tearing their hair out in frustration because they don't know why the page isn't saving, leading to them abandoning the project and leaving a sour taste in their mouths."

It was still possible to edit modules and see mistakes using the console. But of course only people who knew about it would know how to. As far as people abandoning their projects, I don't think that on average it was ever a problem. If Wikia's comment about only 4% of wikias using custom javascript is right. Then one can make an educated guess that less than 0.01% of wikia actually have custom any modules at all. Even community central didn't have any modules for more than 8 months until I added one.

To put it bluntly, it is entirely possible that if the current trend doesn't change for some time, wikia may actually eventually disable lua modules.