What makes bitcoin unsustainable? The fact that it will some day stop rising in value?
No. Reread Impaler's post. What is unsustainable is that transaction fees are rising rapidly, but that at the same time they are unable to cover network costs.
But - the second graph doesn't mean a lot by itself, we need to see transaction fees as a percentage, not as a dollar figure- and even then what's interesting is the median, not the average.
https://blockchain.info/charts/cost-per-transactionThe transaction fee has been adjusted several times already and will be again. And participation in the network is voluntary - if it's too expensive for you, you have the option of not being part of it. Most objections of that sort stem from simple ignorance of some aspects of the system. And I have no doubt people will keep making them for years to come.
I tried to distill the information content of your post, and ended up with the empty set.
Did you make any point?
The linked chart is showing rising transaction fees. And it is showing them to be too high apparently to send a $50 transaction from localbitcoins to bitpay, two of the most popular Bitcoin services.
What "objections of the sort"? We are talking reality of what is anecdotally happening right now, not objections.