TSMC recently indicated it won't grow manufacturing capacity for process nodes older than 28nm. The company will have to convince its clients that are still basing products on 40nm or 65nm to transition to the more expensive 28nm, which will be its primary mature node going forward.
https://www.techspot.com/news/95131-tsmc-wants-sunset-nodes-older-than-28nm.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/95131-tsmc-wants-sunset-nodes-older-than-28nm.html?utm_source=dlvr.it&utm_medium=blogger