TSB said:
Kayaba has to balance how quickly he lets the Thaumatugy System become known to the public. If the System becomes public knowledge before the Players are released, the chance of the Association realizing he's conducting heretical research increases. He probably developed the System entirely on his own and whatever is keeping programmers from accessing the servers and shutting the game down likely prevents them from locating the System as well.
Two things:
Whatever is keeping the programmers from accessing the servers is nothing. They have access to the physical machines, they maintain them, they have the passwords for all security protocols. They set up those security protocols.
Those are their machines. The situation were the SAO playes didn't get rescued at most a few months after the Release is already absurd.
Hell, the problem could have been solved with a EMP, the NerveGear can't fry your brain if it's fried itself. And they had the capabilities to produce NerveGears to experiment with before any attempts they made.
The only possible explanation would be if they were scared shitless of making any attempts at freeing the players for some reason. Public pressure? Some VIP trapped inside making it politically untenable? Who knows.
Now, I know this absurdity is necessary for the story to exist. I just want to make clear that at this point nothing that comes from that corner of the plot is going to make much sense. It literally exists on author fiat, so you can make ti to be whatever you want.
In other words, what you are saying is as good as what I'm saying both end up being the author going "and this happened because I say so" anyway.
As for the Mage Association discovering this new game before the Players get out of SAO... Why in hell should Kayaba care? What he needs is getting a developed Thaumaturgy System out in the open where no one can silence it.
The Association was going to get involved eventually anyway and it isn't like he doesn't have a convenient scapegoat prepared already.
Also, that would depend on the time-frame in which the game is released, the idea is that it became the ALO of this timeline so it wouldn't get released almost until SAO is over already.
Kayaba, if he is even involved with it, could take a calculated risk to push for the Thaumaturgy System to become THE magic system of Full Dive games.
The first to get to these kind of thing has an enormous advantage in setting how the rest of games will design their magic systems.
Trying to get the Thaumaturgy System in the WoW of Full Dive games may be worth the risk for Kayaba.
TSB said:
Besides, Kayaba's company doesn't need to rush into making a new game to recoup its losses. Based on Argo's comments in 13.4, Kayaba's Virtual Interface System has the potential to make them the next Microsoft. They might want to focus on that for the larger profits and to give the public some time to forget their mistake.
First, Kayaba's company, Argus, was bankrupted by the SAO Incident. RECTO Progress is the company that bought Argus and now owns and maintains the SAO Servers as of Canon.
And second, making a change so big to the way user interfaces work and get a profit from it isn't that easy.
They would have to develop a new operative system, or a new "desktop" that worked with an existing one. And then they would have to get other companies to develop software for that interface... of which the original proof of concept ended in unmitigated disaster due to the SAO Incident.
And let's not talk about the general public and how they would receive such a thing after the SAO disaster.
No, they have to prove to the world that their technology is safe to use, especially because no one has an actual need for it as there are perfectly safe a sound interfaces out there.
They already have most of the work done, they only have to put it together and release it. It's a minimal amount of effort and money put forward for the chance to try and regain some prestige for VR technology and try an make up the expenses of buying Argus.