UPDATE: Checking the upcoming schedule at WatchESPN, it looks like free-through-ISP ESPN3 will be practically eliminated on April 12. All the soccer is gone behind the paywall. All college sports but ACC games are gone behind the paywall. Golden Boy Boxing remains on ESPN3, but Top Rank Boxing is gone. The Commonwealth Games remain on ESPN3, but they end in a few days. MLB and NBA seem to be Spanish only on ESPN3. SEC and Longhorn Network are still available, but only to cable subscribers, which is status quo.
So this will be pretty much the end of ESPN3. I doubt the ISPs will be cutting the cost per customer they charge for this greatly diminished service. I'm sure there will be talk of ultimately futile class-action suits, which almost never work. It will be interesting to see what kind of subscription numbers ESPN+ generates. Being a college baseball and football fan and a follower of tennis and European soccer fan, I'll probably be ponying up the $5 a month. I'm surprised I haven't seen any instructions on how to subscribe yet. I guess the details are still being worked out.