I have very mixed feelings about this. Although most of the proposed additions sound great, do we really need to wait 4.5 years to justify them?
These are the sorts of things that should be done on a continual basis, regardless of any upcoming anniversary. Walt called it "plussing"; essentially it's just continuing to tinker with the experience to exceed guest expectations. But given that Disney has been aiming to just-barely meet guest expectations for years, this seems like a radical departure
I blame both management and fans for this mindset. We've already had several years of folks here saying "I wish we had ______, maybe we'll get it for the 50th," despite that anniversary being years away. If instead the attitude were "We need _____, because tickets cost over $120 per day," perhaps these sorts of changes would happen on a more regular basis
In general the heart of this concept seems to be in the right place. I just don't like that we have to wait for an anniversary (one that is still several years away, to boot) to get it implemented. This should be part of the regular program of refurbishments and upgrades in all the parks, not something special worth celebrating.