With the Sony trade-in promotion and instant rebates, now is a good time to buy an A7RII. I recently purchased an A7RII and Zeiss 24-70/4 from B&H, and by trading in an old, no longer used Canon digital Rebel, I knocked better than $1100.00 off the cost of the combination. I believe a similar trade-in promotion also works with the RX1R2, although you won't be able to save as much as I did on my combination. My recollection is that the trade-in promotion runs through March 31.
That said, I don't think an A7RII is really a substitute for an RX1/R/2. While the image stabilization, AF, and auto ISO implementation of the A7RII are huge advantages over my RX1, there isn't a comparable fast 35mm AF lens for the A7RII -- unless you want to go huge, such as with the Sony 35/1.4. As best I can tell, it is not possible to achieve RX1/R/2 image quality in any other package that is as compact, or even nearly as compact. I think the closest you can get is the A7RII and a Sony 35/2.8, but you are giving up a stop, plus, I suspect, other IQ advantages.