It would a crazy idea to assume TSMC have enough advanced node capacity to make key parts for Intel and charge small % of profit. One could wish mobile phone volume go down dramatically. Probably, it could be easier to sell part of the company to TSMC. It is very sad to see great talents, technologies, and culture ruined by some of the empowered leaders in the past 15 or more years - many people still respect old Intel trained CPU and process gurus, including TSMC guys.
Intel can still survive and make $ by cutting down growth hypes and low-return businesses, me-too investments, some management and R&D, ego of owning world's #1 over-aggressive technology, and most importantly, get rid of fat-check magic-trick-seller leaders and board members.
Without a big cancer surgery, Intel would not come back to its golden days - those fat-check s---ers would love to sip out as much juice of this company and put the fake achievements on resumes - if Intel's old bosses can hire those smart evil s---ers, you can imagine other companies might be that stupid, too.