WATERLOO: The chips may be down for New York’s three new commercial casinos, but they aren’t folding. A new report from Reuters says Rivers Casino and Resort in Schnectady, Tioga Downs in the Southern Tier, and del Lago in Seneca County are turning out much weaker revenues than expected. Del Lago’s shortfall seems to be the worst. It’s reported just $63 million in gross revenues since its February opening– that’s about 40 percent less than its first-year projection of $263 million. State officials are reportedly “expressing patience” — and giving credit to the casinos for exceeding expectations when it comes to job creation and construction spending.