As the 432 project fell behind schedule, Intel realized they urgently needed something to sell. Intel quickly threw together a short-lived stopgap processor to sell until the 432 was ready: the 8086 (1978) was a huge success and is still around in the x86 architecture.
The iAPX 432 was finally released in 1981 to great fanfare. But its performance was dismal, 1/4 the speed of the 8086, making the 432 a flop.