I too agree regarding the case of a single miner. I am undecided on the case of multiple miners (and no block reward), however.Thinking more on this, it is self-evident to me that there is an issue in the case of a single miner. But as long as the network is sufficiently decentralized, competition for the available transactions should proprely incentize progression.
I am not suggesting we "ignore the long term." We should (and will) study this and many other properties and emergent phenomenon of the Bitcoin Network over the next decades [unless Bitcoin dies]. In fact, Justus's comments that started this dialog was an example of not ignoring the long term.That said, it is kind of disturbing that your reaction was "In my opinion, potential issues we might (or might not) have to deal with 25 - 50 years from now have nothing to due with increasing the block size limit today." I know you have a horse in the race and have been polarized by all of the BS flying around, but ignoring the long term is a dangerous way to go about things.
However, we shouldn't let some fear about what could happen in the far future (that may turn out to be unfounded) prevented us from addressing a very real issue that exists today. Do you disagree?