This fall, millions of Americans will get their remodeling ideas and inspiration from a new face on the block (see photo). Where's Bob Vila, you might wonder? Some say it was the beginning of the end for Bob when he appeared on Hollywood Squares looking like a lost school kid. Others claim his freewheeling affair with product endorsements didn't sit well with educational television's virtuous image. According to a lengthy article in the August issue of Boston Business, however, it was not that Bob capitalized on his newfound success—that was expected of underpaid PBS stars. Rather, the article claimed that Vila got too big for his overalls and snubbed the show's producer, whose cardinal rule was thou shalt not do product endorsements for companies that