On 1st Corinthians 13:8 - 10, the subject is "charity", and it never fails. Verse 10's "that which is perfect" isn't identified as anything in particular. The point is that the perfect will always replace the not-perfect. In this case, the completed will replace the not completed. Trying to use these verses to show tongues isn't for today is very weak in my opinion.

Using the "signs of an apostle" argument is a much stronger case to prove your position. But, chapters 12 and 14 has an apostle teaching the proper use of these "sign gifts".