I think the walk from most Riviera rooms to the Skyliner is similar to the walk from most BLT rooms to the Monorail. Probably a little longer on average depending on how the elevators are set up and the pathways on the first floor, but that difference may be made up for by the speed at which you get to your destination.
Walking to MK is a special privilege of BLT/CR and unless they create a 5th gate, there will probably be no more new resorts created that allow you to walk directly to a park. And to be fair the opening "member discount" version of the Riviera pricing could get you down to around $160 per point while the direct price of BLT is over $200 per point (demand pricing of course). When Reflections goes on sale, there will likely be a similar long walk to a boat dock for the non-bus transportation and it'll cost more than Riviera did.
It's all personal in terms of what we think these things are worth. I can't see myself paying direct prices moving forward if they keep rising, but a new Riviera contract was barely more than what I paid for a new PVB contract years ago, with similar (IMO) amenities and transportation ease. Waiting to see the execution would cost me more than $20 a point and price me out, so my family decided that we would trust them not to screw up the Skyliner. If the lightning stoppages or walking ability are major issues for you, then staying on cash with ap discounts at the new CSR tower probably stacks up pretty evenly to Riviera without the long term contract.