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...
The issue with a large increase is it creates a slippery slope. Raising the blocksizing is essentially subsidizing transactions. If we persist on doing that someone WILL take advantage of the free space. Now what happens if 8MB blocks get filled up way before the intended increase? It is not an improbable scenario that we could see bigger block get filled surprisingly quickly & the increase will have been more or less for nothing.
If we take the decision to continue subsidizing transactions right now because of pressure from certain groups we will inevitably create a precedent and reinforce the belief of users that they somehow have a RIGHT for block space and therefore make it forever more difficult to refuse it. Imagine the subsequent pressure if Bitcoin grows by a couple orders of magnitude and users start seeing their transaction fees go up when they were told it would forever be nearly free.
This here is an opportunity to put a check on these false expectations and discourage business plans that were planning to unnecessarily fill up the blocks w/ their own transactions. People need to understand that there is cost to having this system run securely and we should stop trying to externalize them.