On the surface, it might look like Sony is moving towards a more Steam-like pricing system, but you are comparing a paid subscription service to a free digital delivery system. It is only similar if you completely ignore the revenue that you are required to pay to experience that service. The Steam cloud and all of your library are available to you any time. Your PS+ purchases and cloud library are only available if you continue to pay for the privilege. Sony leverages that known sub fee to offset any shortcomings in lowering their licensing fees for digital delivery.
It's at most a half-step in the right direction, but the bottom line is that you can never get parity between Steam and console game libraries on the pricing front. Steam is a delivery system, they just make a little skim off the top on each title sold, and have no real vested interest in the actual titles (other than Valve games, that is). Console manufacturers have massive vested interest in their own ecosystem, between hardware sales, R&D, and game licensing. The digital delivery system / game pricing portion is just one part of the whole organism, but it becomes responsible for a huge portion of their revenue. That makes it much harder to change, and the impact of any change can be severe. Quite the conundrum.