If/when MyMagic+ arrives in Anaheim it will have to be a lighter, more nimble, less mandatory hybrid version that bears little resemblance to the Orlando legacy version.
The reason why is due to the lack of a captive audience at Disneyland. There are over 22,000 hotel rooms within walking distance of Disneyland (with three new corporate hotels nearing completion this summer), but only 2,400 of those rooms are owned and operated by Disney. There are only fifty DVC villas at the Disneyland Resort. 50!
Thus, Disney owns and operates barely 10% of the hotel stock for tourists visiting the Disneyland Resort. Plus a similarly small number of the restaurants, shops, bars, tourist services, etc. in the Anaheim Resort District. And all the tourists from Seattle or Seoul or Salt Lake or Sydney who fill all those rooms weekly are using Anaheim as their base camp for extended trips throughout Southern California, in a dynamic environment that Disney has no control over.
The captive audience just isn't there like it is at WDW.
That said, if Disney could figure out a way to give Disneyland Annual Passholders lots of real or perceived value from a reconfigured MyMagic+ system, then Anaheim could go into totally uncharted territory with such a system...