Enter? Companies are trying to keep up.

Just few years ago was four companies doing the bleeding edge: Intel, GlobalFoundries, Samsung and TSMC. Intel was the best. First Global Foundries could not keep up. Then Intel fumbled ant TSMC became the best. Samsung is the only one keeping up with TSMC but they come slightly behind. Intel tries to catch up the two. No companies have "exited" they just can't compete.

The bleeding edge semiconductor node design is like doing Apollo moon program every 4-5 years. Only one can be the best.