The rationale I have is the dismantling of the privately-owned FED, move to NESARA, over the next year (the FED will be allowed to operate for one more year to ramp-down, while NESARA is fully engaged). Tied to this is taking down COMEX and paper silver.
You can search and dig on the net for NESARA/GESARA/QFS/etc.
As for physical silver price from $27, see the usdebtclock.org, and look for the box with "Dollar to Silver ratio now". That is a ballpark (caveats exist on what that number means). When paper silver "exists", COMEX artifically maintains a low silver price (historically more like in the low teen's). It is at $27 now because we are nearing the change to NESARA and gold-back currency.