Heres an analogy that most hackers can identify with-- the local coffee shop. The agreement there is implicit as well (and sometimes explicit): buy this coffee, and you can use the internet. Should you get free internet without buying the coffee?
Except coffee shops are for-profit. I'm not concerned Wikipedia will disappear. I am concerned that the NY Times online will disappear, because it needs to sustain a profit.
(For the record, I actually worry if my coffee purchase really does offset my resource usage when I stay for 3-4 hours in my local coffee shop on weekends.)
WiFi or no WiFi, beverage or no beverage, a coffee house lets you hang out until the manager decides to throw you out. Likewise, NYTimes.com can revamp its site such that nonsubscribers are limited to 1 hour at the site with 24 hours in between, like HN's noprocrast.