question about the listening passage 3

Hello members of English team,
I really appreciate your help for nonnative speaker.
Could u please explain following sentences about the listening 3.
‘‘Saving ninety minutes is not going to commit old and middle English to total oblivion, after all.’’
please explain the meaning of ‘‘after all ‘’ and oblivion’’

You (note there is no such word as ‘u’) can be more independent by using a Learner’s Dictionary to find the meaning of words like ‘oblivion’. Take a look for yourself first, then if you are still confused, ask again.

Please provide the link to the listening exercise you are asking about.