Considering the fact that Chase and Amex will both be
issuing (different)
cards when the new Marriott
card lineup comes out (See: Marriott announces new
credit card lineup), this could be a last chance at a very
lucrative welcome offer that matches the largest bonus ever offered on this
card.
Alternatively, if you have a large
credit line on a non-rewards-earning
credit card like the Chase Slate from your pre-travel-hacking days, then you might decide to transfer the
credit line to a more
lucrative card also
issued by Chase.