Leader in turbine design and associated control systems is GE.
Wartsilla... as per my knowledge is into slow speed engines, based on crude oil combustion.
They do have a similar component called Turbo charger, which circulate the flue gases... essentially a turbine but they buy it form 2 external suppliers. Which is simply a complimenting component of power a system not the prime mover.
Better alloys in future may increase MTBSI, but future energy market is moving towards renewables.
There will be no new firms popping up in future.
As I agreed, fighter a/c engine still doesn't have an alternate.
If Pakistan need to go down that path, they need to find their way in to the ME market and take experience and than they will have manpower available, which can help in building turbine designs.