That number is growing by the hour and we shall see what happens on the 14th. There's not much stopping the participating subs from continuing indefinitely. If it's not declared as infinite, it's even harder to justify replacing them.

For example, /r/askhistorians is going private for 48h and reopens readonly indefinitely after. /r/pathofexile as far as I understand won't be going private but goes readonly once again indefinitely. etc