Personally, Amex has to come up with something to keep me around. My wife and I each have the Plat, Gold and SPG. My Plat just renewed and I won't keep it, hers is in a few months. Losing Marco Polo without replacing it, the $699 fee and the fact that they only have have two airline partners with a 1:1 transfer (and I am moving on from Aeroplan). The 50% Avios transfer is what I am waiting for but it is looking bleak.

While it sucks the SPG is only one point per, the airlines available for transfer is amazing. Probably keep the SPG and look at any signup bonuses for the Plat and Gold down the road.