Hotel program changes affects me most:
Being Europe base, mostly Europe travel, this is how it lookes for me:

IHG Spire -> will ditch, since the enhancements unless I buy Ambassador and keep it
Hilton Gold (matched earlier to Dia but lost it) -> kept Gold and plan to stay Gold. But the earn-burn ratio is bad for me (I have no sign-ups etc difficult to "max" promos etc)
Carlson Gold -> zero, dumped it due to enhancements and removal of 2-4-1 booking
Scandic 2nd floor -> stays on 2nd floor by stays
Choice (nordic choice) Platinum (by matching) -> Silver, too low footprint to keep me higher
Marriot zero - never considered good for me due to footprint and unclear status&benefits&earnburn-ratio to my liking
Hyatt zero - same as Marriot, but even lower footpring in Europe
SPG zero - crazy expensive luxury for me where I use to stay.

So it looks very bad for me. I don't really know where I should put my butt nowadays. Hotes.com is bad IMO. Booking.com too.