You're missing the point. What in heaven's name justifies implementing 8GB blocks? By your logic, we can just have 64GB blocks and even more prohibitive costs to running nodes. After all, who cares, right?
Certainly, current transaction volume doesn't suggest this is necessary at all. Why aim for Moore's Law? Let's observe how robust scalability is on a more conservative basis, and keep limit increases in line with actual transaction growth (rather than this fantasy that Moore's Law = bitcoin adoption rising exponentially, endlessly).
i am not suggesting going to 8gb blocks now...
8mb and doubling every two years as with a lower soft-limit is good...
Good, why? I haven't seen this adequately explained. Considering we are not even reaching capacity at 1MB, 8MB is completely arbitrary. 8GB is beyond arbitrary -- it's simply out of touch with reality. The only possible justification is Moore's Law, and as I pointed out above, this is an illogical and unscientific basis to go by.