Thank you for your replies. These have led me to a few more questions that I'd be really interested in discussing more.

8. (Sorry if this is a stupid question) Stepping back a little, why isn't blockchain technology scalable? Let's say one person makes one transaction per day paying a fee of 1 unit which is enough to attract enough miners to process the transactions in a practical time period. Won't a billion people each making one transaction per day pay a billion units in fees? So why isn't there a proportional incentive for miners and hence the number of miners scaling up accordingly?

9. Why does centralisation improve scalability?

10. How does market sharing between competitor networks or sidechains actually help? Surely you still have the same problem with a limited amount of processing power for, say, 100 transactions per second on one network versus 50 transactions per second on each of two networks?

11. Do we know any more details about these 3.0 platforms that Fuserleer mentioned? How are they fundamentally different?