Now my guess based on gut feeling and remembering the original rationale behind these models.
I think RME will keep the current lineup with three devices.
The ADI-2 DAC FS was introduced at €999, positioned just below €1000, and tailored more towards HiFi use. Its reference levels are optimized for HiFi equipment, it adds a dedicated phones output for IEMs, and omits studio-oriented features like AES I/O and additional digital outputs.
What some users missed were analog inputs to digitize analog recordings, which require an AD converter. That’s why I always recommended the ADI-2 Pro FS R BE instead: adding analog I/O to the DAC FS via an ADI-2 FS becomes pricier than directly buying the Pro model, which also includes more features.
The ADI-2/4 Pro SE was launched as a “special edition” for studio and HiFi users with higher demands. It started around €2480, clearly above the Pro model at €1550–1650, and only makes sense if you really need the extra functions such as turntable support, a fifth reference level, Pentaconn output, trigger port, etc. Its last price was around €1950.
IMHO discontinuing the ADI-2 Pro FS R BE would be a mistake. Its mid-range price makes it accessible, and it remains attractive for HiFi users who want to archive analog sources in the highest quality. It combines analog I/O, digital outputs, AES I/O, balanced phones, and also an SRC—at a still reasonable price given the feature set.
Therefore, I believe RME will continue to offer three models covering price ranges of about €1000, €1500, and €2000. If one product were discontinued, then only two combinations would remain:
A. ADI-2 DAC FS + ADI-2/4 Pro SE
B. ADI-2 Pro FS R BE + ADI-2/4 Pro SE
While the DAC FS succeeded largely due to its €1000–1150 price point, option B makes more sense. Features like analog I/O, SRC, and balanced phones are relevant for HiFi use.
Finally, a lineup with only the ADI-2/4 Pro SE would likely shrink sales, as not everyone wants to spend €2000–2400 right away. And if a successor model were to appear, its launch price would probably be closer to €2400 again.
BR Ramses - HDSPe MADI FX, M-1620 Pro D, 12Mic, UFX III, ADI-2 Pro FS R BE, Nuendo 15, Win10 IoT Ent