Even as baseball players continue to strike, bullish owners are plotting to put new teams on the field in Phoenix and Tampa Bay by 1998. Owners tomorrow will decide whether to add the Tampa Bay Devil Rays and the Arizona Diamondbacks to the major league roster. Phoenix Mayor Skip Rimsza told TIME Daily the strike has not dampened the excitement in his city. "It's not over till it's over," said Rimsza. Back on the picket line, the National Labor Relations Board tomorrow is expected to validate an unfair labor practice charge filed by the players. If so, the owners very well may lock them out.