If I am descended from an Irishman, why are there still Irish?
Because you did descend from an Irishman.
I thought the question was If we come from monkeys, why are monkeys not turning into humans still?
So your question, if it is to correspond, should rightly be, if I descended from an Irishman, why are Irishmen not extinct?
The answer is still, because you descended from an Irishman.
Why are people not descending from apes, monkeys, or the imagined common ancestor?
The answer - Because man didn't descend from any of them.
Wh can't man reproduce this process in any lab?
Because it never happened.
...and
@ChristineM And if christians evolved from Jews then why are there still jews?
Because ... um. Christians evolved from Jews? That's so wrong.
The time machine wouldn't work even in a billion years, as every time lapse video shows man's ability to speed up any process.
evolutionary changes can be produced 150 times as fast by the use of X-rays as they can by the ordinary processes of nature.
The Speed of Mutations
According to "Molecular Biology of the Cell":
Only about one nucleotide pair in a thousand is randomly changed every 200,000 years. Even so, in a population of 10,000 individuals, every possible nucleotide substitution will have been "tried out" on about 50 occasions in the course of a million years, which is a short span of time in relation to the evolution of species. Much of the variation created in this way will be disadvantageous to the organism and will be selected against in the population. When a rare variant sequence is advantageous, however, it will be rapidly propagated by natural selection. Consequently, it can be expected that in any given species the functions of most genes will have been optimized by random point mutation and selection.
According to the book "Evolution," by Ruth Moore, it is possible to speed up mutations with radiation: