It could be a problem IF someone is going to create as many new accounts as there are players on this server right now.
That number is >10.000. No one is going to create 10.000 alts, really.
Conclusion: this 'problem' does not exist.
10 000 registered players is not the same as 10 000 active players, as I already cited, information for now is that inactive players wont count (otherwise I would not count alts as problem, since we have enough players who left to replace alts in the example). Tournament gives not reliable data of less then 2 500 players (but 100% active).
And one other example. No 100 alts this time (this number was needed only to get everyone
gold).
If every active player will create 1 alt, it will populate hobby level and let people get prizes from higher league (which is positive from player's point of view, so we can count that it is not a problem for now, can't we?). Some already have that much on live servers due to possibility to create cities on multiple servers from the same group (en-de-etc.), not really helping themself in this case, but other server, but still.
And what about 2 alts? May be 3 alts? 3 alts from every active player let every active player get at least bronze.
So, my question is, is this system good? Why should my result be dependent on the fact how many players will be
weakly represented in the event (new players, alts, just busy people) not just on my achievements, not only earned scores? We can ignore or even use this simple math to improve our own results, no doubt, and say that we have no problem with this system. May be, this even was developers intention, I do not know.