Data point:
Canceled AMEX personal plat. in Feb. 2015 (used $200 travel credit for year).
Applied for AMEX ameriprise (not a customer of ameriprise) two weeks ago. Approved!
Received card, put over 3K (non-MS spend) on it. Looked online, said "eligible" for travel credit. Signed up, bought airline GC and awaiting credit (should post, not worried).
Just checked my account and see the 25K bonus has posted too (was worried since closed last AMEX personal plat just a couple months ago.)