There is no legal significance, or to the extent there is, it amounts to erasing the trail of malfeasance.
All warrants expire. The warrants are basically time-limited licenses from the courts to snoop, and any evidence obtained will be admissible in trial. This is asinine because virtually no FISA-obtained evidence sees the light of day in a courtroom. The entire process is secret permission to conduct secret snooping, with the goal being to deny that the snooping is taking place.
The FISA system is a variation of punishment by process, except the punishment is being surveilled so the government actors gain whatever personal advantage attaches to that, for them.
And Carter Page is still a Brennan dirt bag. Hes not suing anyone. Thats a big joke. He was the fool and the foil in this whole FISA joke.
Hannity is too stupid to figure this out. He lost his mind last night.....