Here's my take, first off it great to see the Strike program continue at the Fours Queens and Sam's Town and this could lead to other casinos getting back into Silver Strikes. The $300 strike appears to be the only viable option for the time being. Having sold a number of $200s I believe the $300s to initially sell for $420 ($14 per $10 strike) at the time of release then drop to $340 to $360 in aftermarket depending on popularity of given $300 strike. Futhermore I believe if the $300 strike stays in play it will push $200s up in price to $300 plus. Most collectors recognizing the value be to had with the $200s. My longterm guess is that the IGT or Sunshine Mint will reinvent the Silver Strike program in the coming years and at an outside chance make the older/rarer strikes including some low mintage $200s more valuable. Worst case, you silver content value as Paul mentioned. All of that said, the price of silver will ultimately influence pricing so it is anyone's guess.
Ed