Actually latest speculation is that mk2 won’t cost much more than DSD, but will not include a bridge option so external streamer will be required (mk2 not a one box streaming system).
Like any component that gets replaced, sure there will be deals to be had on the old technology. It’s like a seven year old dac, isn’t it? In dac years that’s pretty ancient. But yeah, probably good value.
Depending on what you mean by “cost a fortune” you may be confusing the mk2 with the TSS, a product now on long term hold it seems (meaning at least a year likely longer out), which is likely to cost much more than DSD or mk2