This just isn't how the semiconductor industry works. You invest in leading edge and then you try to find demand for the older stuff. There's tiny margins for the older stuff- because the people choosing to use it are literally choosing it for cost reasons and there's no competitive advantage - they can shop around to any of the fabs. The capital investment is all done and you're just trying to make the most of the sunk costs.
It would also be a choice to basically not be a company in 10 years. The low end stuff is the stuff that was bleeding edge 10-15 years ago. If you decide to focus on that older stuff and don't chase after the bleeding edge then in 10-15 years you simply won't have anything competitive at any level, your company will basically be done - your 45nm process will be competing with TSMC's 16nm (which will now be old tech) and you'll just slowly move up and up out of competitive markets.
It would also be a choice to basically not be a company in 10 years. The low end stuff is the stuff that was bleeding edge 10-15 years ago. If you decide to focus on that older stuff and don't chase after the bleeding edge then in 10-15 years you simply won't have anything competitive at any level, your company will basically be done - your 45nm process will be competing with TSMC's 16nm (which will now be old tech) and you'll just slowly move up and up out of competitive markets.