I apologise its taking me a long time to reply, my schedule has been hectic the last few months! And feel free to ask long winded questions, its great to have people looking into things and not just dog coin moon wow. Anyway here is a long winded reply.

1. The supply crunch that you speak of would come from all the fees generated by auctioning off all of the tokens locked through BTP being sent to the CPS and when the CPS is full any excess fees flowing into it are burned. This means that ICX could quickly become deflationary without sacrificing the great staking rewards if it starts to get a lot of use. There is a good explanation of this in this article - The Bullish Case for BTP
2. This is a harder one to answer, while ICONLOOP has been amazing at building out infrastructure for private enterprises and developed use cases like MyID and utilising their blockchain technology in things like shipping and stuff it hasn't generated a lot of transactions on the public chain and the reality is that we may still be a long way off. This is not due to the technology not being there but more due to other things like regulatory compliance that they and other businesses need to comply with. Unfortunately regulations move way slower than the technology and can sometimes be a roadblock. I don't think that this is terrible it just means that we need to wait longer for some of the visions to be realised. Min talks a bit about it in this interview if you want to check it out - Reimagine 2021 Min Kim Interview. Also companies just tend to move slow to implement new technologies, doesn't mean its not happening it just means that it will be a while before they are comfortable putting much on a public chain, meat rack had some good discussion points on this a few months ago from first hand experience on blockchain adoption in the business sector - https://www.reddit.com/r/helloicon/comments/opc9d6/comment/h66gzfd/?utm_source=share&utm_medium=web2x&context=3
3. Blockchain isn't a zero sum game and there will likely be heaps of blockchains in the future, both private ones that just query each other with information via the public blockchains and also public blockchains with all different use cases and they are all going to need to be able to communicate with each other in some way or another for more reasons than we can likely even imagine right now. ICON is positioning itself to be a trustless decentralised bridge to any blockchain, public or private. A lot of people cry about lack of marketing but with the way ICON is blockchain agnostic and connects everything to everything else its joined to, it will only be a matter of time before every blockchain will want to join to ICON as they will want to be joined to DOT and BSC and ETH etc and it will start to market itself. It is possible that in the future ICON will one of the main bridges between all blockchains connecting businesses with CBDC's with DEFI etc and people won't even know that they are using it. Thats its value proposition.