That $5 McDonald's value deal might not be cheap enough

• McDonald's said it got an early boost from its $5 meal deal promotion.
• But fast-food chains need more than limited-time offers to get diners back, an analyst said.
• Other restaurant chains, such as Taco Bell, have come out with revised permanent value menus lately.

Fast-food restaurants are getting an important reminder lately: They need more than temporary deals to get customers in the door after years of inflation.