The construction of Kra Isthmus Canal and Arctic shipping route will be real threats in about 15-20 years' time.
When MY build the Tg Pelepas and Pasir Gudang port in JB, it was thought that it will be a threat to PSA. But it didn't really happen.
When MY spent billions to build the Port Klang Free Zone (PKFZ), it was also thought that it will be a threat to PSA. But it didn't really happen.
SG had already successfully established itself as the regional hub and unless someone is to build another similar sized deep water port with a strategic location and run it as efficiently, PSA will be hard to overtake.
The Kra Isthmus Canal was meant to cut short the shipping time by a day for east/west route, bypassing the Malacca Straits .
Its mainly for ships travelling directly from port in the east to the Indian Ocean and beyond and vice versa eg. Japan, Korea, China to Europe, Africa.
SG status as the regional hub will not be threaten by the yet to be build Canal at least for another generation.