Where is the evidence for this change or why is it plausible? Unless you have some information I don't, it has never been the case and there isn't a reason to expect it. I hope it can happen, but manufacturing shows no signs that we may make it from a more common material, if anything they will use an even rarer more difficult process because purity of materials is very important and the result of lower quality silicon is so bad that nobody uses it, the chip shortage and reliance on a few places isn't ideal but there is no alternative except not to use them, which is possible. There is a lot of interest for everyone to have it but its not plasible, it can be minized but the refinement is very important, and there isn't any reason for a small community to stop buying globally thir plans at the highest quality plants have better yields, better quality, and they will be more energy efficient. Homegrown parts will not even work because it relies on economies of scale.

However, it is plausible to not rely too much on microchips in general, a pot can control fan speed with older motors, but we lose brushless fans. You may really enjoy post collapse guides if you are interested in what can be made locally.

http://www.survivorlibrary.com/

There are great youtube videos on like primative technology as well that makes things from scratch, even steel cannot be made locally without the proper materials so there needs to be some sort of global/larger community unless they live in a resource rich environment (the US does not have metals like Eurasia does).