Keeping both around at the same time would be like if arch-rival Ferrari offered both the old California and new California T (or the 360 Modena and the F430 that followed) at the same time. Yet McLaren has remained adamant that the 12C isn't going anywhere despite the arrival of the 650S.
Or is it? Well, yes and no. Reports coming in from the UK indicate that, while McLaren will continue to offer the 12C to customers who order it, the company has actually ceased production of the older, less expensive version for the time being in order to gear up for producing the newer 650S.
Keeping both models on the order sheet will likely cease once McLaren's upcoming entry-level model, dubbed P13, comes along. Essentially replacing the 12C with the 650S at that point will allow Woking to open up a bigger price difference between it and the new model, helping to differentiate between the two. In the meantime, the House that Bruce (or Ron) Built appears to be taking a similar approach to Pagani, which kept the Zonda on offer long after the Huayra came along.