By the time 2050 rolls around, the total number of TV households in the U.S. will increase to 163.7 million from 111.4 million today, a growth of 47 percent, according to estimates released Thursday by Nielsen Research. The expansion of the TV market will be led by minorities -- especially by the number of Hispanic households, which is expected to increase 136 percent. African-American households are expected to rise 66 percent.