That's not how Nxt works. The account that forges the next block is selected from only online accounts with an effective stake, not from all existing accounts.
Whilst I do *get* the idea behind how the TF "choice" works I don't quite follow this part.
How can every node know which accounts are "online" (in order to consider for TF) when nodes would only be keeping connections to a fraction of all online nodes?
Transparent Forging called transparent for a reason: in next phases of implementation TF (it's not complete for now) each tx's broadcaster'll scan network and calculate 100%-s of block success by working nodes in next 15 secs, asking them for their effectiveBalance and looking for network's BaseTarget (how many coins're forging now), then send tx info directly to them. Ofc, there still be orphans, some network dynamic dividing (nodes on/off, providers problems, geography and so on) and need to rebroadcast. This's my understanding, hot it'll work.
But bigger Nxt'll be, stronger network effect'll be. Compare it to torrents: when u're starting to download popular file, u're reaching cap speed almost instantly, cos exactly of network effect: more peers are, easier to set up complete map of interconnections and create optimal set of seeders for u.