Its not like the lace suddenly 'pops-up' and is unattached. The glue just becomes less tacky and firm so that if you were to pull the front hairs, the lace would start to lift from the scalp and thats one of the reasons people don't like their hair touched!
You would be able to push it down again and it would lay flat. It just wouldn't be as secure as it was when you first attached it.
All you have to do is pull a few hairs forward on to the forehead and the problem is disguised, no matter how close people get.
The best plan is to work out how long (on average) a good attachment you get before the glue starts to break down and always reattach the front a day before it happens.
Using ORWG, you could easily do a reattachment ever 3 days a long the front and at most it would take you 15-20 minutes.
It gives you peace of mind.