more likely the bugs will shift complexity. this has happened before, but slower. then that added complexity will make the new backdoors and 0days even more expensive again.

in the beginning, ppl didnt know a lot, and default passwords and stack overflows were 0days.

then awareness came and a lot of that is actually fixed. Writing a modern exploit more often now requires many stages and a shit ton of skills and knowledge.

that will increase.

nothing will be 'fixed' in that utopian sense.