Stern haven't been spending money on Vaults since Spiderman VE - all new art and DMD graphics - which I suspect may not have sold as well as they'd hoped given the effort invested. If it did sell less well than hoped, I suspect it may be because so many had serious quality issues .... it was the canary in the coal mine before the farce with GB. But I doubt the bean counters would be willing to acknowledge that.
ST 'VE' is identical. ACDC, changes are absolutely minimal. Both have sold for little to no additional effort.
I think Stern are more keen on minimal cost and maximum return.
Trouble is, the low hanging fruit is running out. I can imagine them giving Metallica or TWD a break for a year and then bringing them back as 'VE' SKUs.
After that though, they'd have to start doing something like Spiderman IMO. As I'd said in another thread, I was told that GoT was a candidate for such treatment. Tron obviously is. The question is would either actually make the investment worth it? People are also talking about LotR, but there are so many out there already, cost of porting WhiteStar to SAM is unknown, then presumably new art and DMD animations, and a top $ license.
It wouldn't surprise me if we don't get anything like SM VE again, but on the other hand it woukdn't surprise me if they do try it again.