When can I use "will" in a temporal adverbial clause?

[sitifan]

Normally, a time clause uses the present tense even when it refers to the future:

• I'll call you when I arrive. ✓
• I'll call you when I will arrive. ✗
• Wait here until she comes. ✓
• Wait here until she will come. ✗

When can I use "will" in a temporal adverbial clause as the quotation below?​

"In reality the influence of both our secular and Christian cultures is such that few of us enter adulthood without the need for some--often drastic-- revising of our ideals before we will be in a position to find a suitable mate or make healthy decisions about marriage." (My bold.)
Source: M. Blaine Smith, Should I Get Married?, Revised Edition, pages 13-14.

 

[jutfrank]

I think the question is this: What modal meaning does 'will' bring to this sentence?

I think it's predictive, broadly speaking. It's helping to say that if we don't revise our ideals, the predicted result is that we won't be in a position to find a suitable mate.