The argument is flawed in several particulars.

  1. The purpose of miracles was to confirm the truth of the gospel (Mark 16:20; Hebrews 2:3,4) – not people per se; yet this passage speaks of confirming Christians. Obviously the confirmation here suggested is not the same as in these other contexts.
  2. The passage no more asserts that miracles will continue to the end of time than it argues the Corinthians themselves would continue to live unto the end of time.
  3. The term “end” (telos) can mean “to the uttermost” (cf. John 13:1), and so may not have reference in this context to time as such.
  4. Later in this same book Paul contends that supernatural gifts will continue only until “the perfect thing,” i.e., the completion of New Testament revelation, comes (1 Corinthians 13:8ff). The apostle does not contradict himself in 1 Corinthian 1:8 and 13:8ff.
So, underline the pronoun “you” in this verse and marginally note: Personal confirmation; not truth confirmation as in Mark 16:20. Then, underscore “end” and note: Completely – not a time reference. See 1 Corinthians 13:8ff.