It sounds like yet again - someone is concerned about the unfairnesss of initial distribution more than the other important characteristics of the system.
Perhaps you could fast-forward to a time where bitcoin distribution has played out (approx 21M coins issues) and the function of mining is to secure the system.
What advantage does ?coin give and what problem is ?coin solving at this point?
Also - have you taken into consideration the 'perverse incentives' your system of measuring economic activity may encourage?
You talk of:
.. but in fact it is possible nowdays (and moreso every day) to steam up entire networks of virtual nodes running sophisticated software stacks - and we don't need to talk of 'majorities' for this to be a problem.
If fake economic activity gives even a marginal profit - it will become widespread enough to accelerate scalability issues on your chain.
Right, it is vaporware, no denying that. As I said before I started this thread, there's practically zero chance of this idea coming to market.
now to address your attack scenario:
I'm sorry that I can't provide in-depth descriptions of some of the critical measures that I wish to protect. I've already mentioned that there exists certain systemic assumptions that protect the network from automated attack. The only thing I can elaborate further on about these assumptions is that they don't RELY on breaking pseudo-anonymity to maintain the network, but that self-identification on the network DOES play a role. The only parallel that might be familiar to you is something like the intended functionality of namecoin. Use your imagination from there because I'm sorry, but this is already giving some good hints to any clever devs who know where I'm going with this.
Again, it's certainly feasible that ?coin could be gamed, but the point at which it's feasible for an attack to compromise the network is a point at which any sane end-user or merchant would have already liquefied his holdings into a competing currency. The beginning of the ?coin economy is protected from this because it will be built on trusted agents. This is what I mean by merchants being first-class citizens. This also ties into the namecoin-esque functionality of the design. Could some malicious merchant try to become established enough within the chain to at some point in the future leverage their position for ill? Sure, but unless that particular entity was basically 70% of the network transactions itself, all they would accomplish by trying to attack the chain by flooding it with bogus transactions is quickly removing themselves from the block weighting.
That's important to note: the quicker an attacker tries to exploit the system, the faster the system is able to remove their influence from the block weights,