Ideas for full dive:
1- mri scaning to monitor you
2-indused paralysis for safety and some sort of brain chip that can control the flow of brain activities[your sences] (personaly im not thrilled with the chip idea but it seems like the most pracrical option)
3- brain security can be just simple checks, if something doesnt check out (like a spike in brain activity that may reprisent pain, idk) you are pulled out of the “dive”
4- dreaming will most likely not work because you expirience just as much sence wise as you do away, its just more complicated
5- in addition to regular functionality checks, being “hacked” could be stoped by somthing like a rationality detector, if something seems irrational you just get pulled out, plus what is the worst thing that can be done to you, as far as i know you cant ddos attack your brain but even if you could you could be removed from emersion
6- nanotechnology seems dangerous, idk much about the field but i dont think many people would want millions of micro ai robots in there head 24/7
7- the technology itself seems really simular to a console and a controller, you imput, the console outputs (ex vibration) ik it would be alot more complicated science wise though
8- i beleive this technology will be available to the public widely in around 30-40 years, it will need a lot of time to be tested and perfected, and to design games to make it enjoyable, i think we will have developed most of it in about 10 years, it really depends on how many scientists and engineers work on it
9- i think companied like call of duty and other large games will do most of the coding work, do to the fact that thats what they do already