We regularly find new information through archaeology. Once archaeologists can dig up new evidence it can be examined, and it can be added to our understanding of all the relevant fields.

History isn't like a jigsaw puzzle, there is no final missing piece, it's more like a never ending brick wall. Sometimes there are bricks missing in the middle that need to be replaced, sometimes there's new information found that makes the wall higher, or wider, but it's still very sturdy and isn't going to fall over just because a new brick is found.

There's no "status quo" to shake up, finding new information, adding to understanding, and arguing for new perspectives is what academics do. Anyone who is telling you that there's some grand conspiracy has a reason to be lying to you. Go on down to your local university library and read through some historical journals (or see if you can get free access on Jstor) and read some recent articles on new finds. Academia is constantly telling older historians that they got things wrong, it's part of the process. There's no point in publishing a work to say "good job, chaps, nothing's changed" it's a necessity of the job to continually make new arguments, new positions, and change the field. It's a requirement for getting a PhD to do work that no one has done before. And that's a good thing!