The story of Lewyt is filled with lies, greed, deception, and even a few deaths.
Some, like Universal, Kingston, Hamilton Beach, GE, Premier, Sunbeam - their stories are simply that tastes changed, and the profit margin in vacuums fell so short that many companies just stopped making them (we can thank discount stores like K-Mart for that). Everyone was advertising the lowest price on vacuums, until there was no where left to cheapen the machines.
The ones that stayed on the market cheapened the motor (think Eureka Bravo and Hoover Elite), cheapened the plastic (Regina Housekeeper), and shortened the life expectancy to almost nothing. Then, when you thought they couldn't get any worse, they moved production to China and got WORSE.