Looking back to the industrial revolution, this exact type of situation happened. Companies became dependent on other companies. Looking at what the Rockefellers and Vanderbilts and other rail magnates did in the 1820-1920's is that they absorbed other companies and made their own products. This is the same business plan that Intel has, by keeping it all in-house. AMD is now feeling the pain of their decision to separate from Glo-flo and go with TSMC. They have no choice but to rely upon TSMC now.
It is now very likely that TSMC will increase the cost of their products, to offset the cost of purchasing new fabs to increase production. Be ready to pay more for your Ryzens....