If TSMC buckle under US pressure and stop supplying to Huawei , then Chinese government should step in and force TSMC to sell it's Nanjing fab to Chinese player SMIC, and use that plant to run SMIC 14/12nm. This way capacity greatly increased. Hopefully SMIC can extend to 7nm using nonEUV equipments
It's not a capacity issue. There's more than enough money for SMIC to build and equip any number of fabs that it wants.
What is lacking is the personnel and expertise to run the fabs, and develop further.