If Nano currency can survive with out any reward system to run nodes and be representative, there is good chance that we will achieve it.
The only reason to run a node is, that it is quite cheap, you can make PoW for your transactions yourself and you support network you like and probably keep value of your coins. The community is also responsible to diversify voting power to as many representatives as possible to mitigate risk of bad behaviour on their owners.
For SafeNetwork that would mean if price is too high, community have to add more storage, if price is too low add more data and any larger holder of SNT should invest time and resources to protect own investment and not wait for others.
Anyway I also think that some other communities will run own fork as replacement of community torrent trackers. They never got reward to seed them and never paid to upload, but with own network, they will have much better control over data and privacy (and after hitting million users will rise the coin price and be super rich )
Anyway we are the ones who can only grow to be bigger and bigger and we will attract user from all other sites and countries and probably “steal” some from Sia, Storj or Filecoin.