Most of the short film studios, both live-action and animated, were in decline by the 1950s, pressured both by the loss of film audiences to television as well as the increased popularity (and financial benefits) of low-budget, stylized, limited animation.
Most of the studios cashed out of the short-film production business and began licensing or selling their back catalogs to television.
It remained on the air for nearly twelve years (and featured The Mighty Heroes during the final season).
Mighty Mouse cartoons became a staple of children's television programming for a period of over thirty years, from the 1950s through the 1980s.
Terrytoons, under CBS ownership, produced only three further Mighty Mouse theatrical cartoons in the 1959–1961 time frame (this was in marked contrast to other animated cartoon lines such as Looney Tunes, Tom & Jerry and Woody Woodpecker, all of which continued to produce new film shorts for nearly a decade after licensing their library to television).