Everyone should realize that all this what-if is theorizing. It's very understandable to be concerned, but it's pretty much a crap-shoot, I think.
For your specific question:
Just because it won't show on your credit reports any more, due to the 7-year reporting rule, doesn't mean that a company doesn't keep internal records that go back much, much farther than that. So three possibilities:
they'll see it on their internal records and deny
they'll see it on their internal records and say why not, you've cleaned up your act
they won't see it on their internal records, because they didn't merge the old history into the new cleanly.
Anything else is guesswork.
I'd keep doing your clean-up and make sure that by then, your credit is diversified among multiple lenders.
The rule book is being re-written during all this, I think.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007