I agree, $21 won't be "The" number that makes life wonderful for this sector in an explosive way. However, looks like we'll find out real, real soon since we're there right now. I would love to be absolutely wrong.
Expert analysts pick numbers as the "keys" to the PM kingdom with the result being that they then pick the next number that is "key."
Now, don't confuse the increasing interest in this sector with a so-called explosion. Interest has been ramping up already before $21, and will continue ramping up in a parabolic curve has prices keep increasing. $21 is just a point on the parabolic curve.
As long as the current financial system exist, which is controlled by the banksters, I contend there won't be an explosion at any particular PM price. The explosion will take place the day the system collapses, and that day is getting closer and closer. We can all feel it, sense it, taste it since it's so close.
The moment that happens the parabolic ramp up we are currently on will be destroyed in favor of a missile launch in price, or what others are calling the explosion in price.
Silver is at $21+ at this moment. Let's see if the launch button has been pushed, if flames are just developing the push to overcome gravity. I hope so, but so far the missile is still sitting on the launch pad still clamped to the ramp (the curve).
Terry