I would think a "significant plot point" would revolve around something causing Bruce to need a new suit....sure maybe acid, but what if it's driven by tragety?
For instance someone significant dies or is seriously harmed and either Bruce realises he cannot keep up with the baddies in his old suit or (Im leaning toward this more) Bruce becomes more driven and angered after a tragety that he developes less reguard for his own body or he realises he needs to preform better and the old suit wont cut it?
Or even this scenerio- Lucious retires
(A big box is placed on Bruce Waynes desk, Bruce looks up to see Lucious Fox grinning at him)
Bruce- What's this?
Lucious- Consider it my retirement gift..
Bruce- Didn't you get the Wayne Enterprises coffee mug?
Lucious- Oh, I got that.....I particullary like the car that came with it.
Bruce- Just a little thank you....
Lucious- Yea, I liked my last check too...
Bruce- That was the big thank you.
Lucious- Well here is my big thank you to you.
Bruce- For what?
Lucious- For doing what you do.....and giving this city, my city...hope.
(Opens the gift to see a new Bat suit)
Bruce- Thanks lucious...