Highly unlikely. While a new file format may take a while to be coded into existing programs, pretty much any digital file since the era of mainframes are still readable. Prior to that storage was enormously expensive, and tapes were routinely erased and reused. Much historic data from early space exploration has been forever lost. That is not the case today.
Digital files do not degenerate and code is forever. Need to view a rare Amiga HAM image file from 1985? The format is well documented, and there are applications that can still access it. In mainframe days, data formats were proprietary oft-times, thus hard to access. Not so now. Local storage is trivial in price, and cloud storage readily available.
To preserve your RAF files means keeping a level of redundancy—as in backups. With countless thousands of files being generated daily, even if the format is later abandoned, the code to decipher them will live on through everything short of a global meltdown. JPEGs have only a fraction of the data contained in a RAF. They are a convenience, being small can be transmitted quickly. They are more than adequate as a display format. No harm in shooting RAW+JPEG or having some batch processing application generate a set. A nice supplement to RAW, but no substitute.
RAW is not actually an image file format, but rather the raw data off your sensor plus information on your camera settings and information on how to interpret it. It is primarily where you start producing the final image be it a JPEG to be embedded in a web page, used in a slide show or made into a print. It is truly your original and should be carefully preserved. Not a software problem. However, optical discs can shatter and hard drives crash. Obscure formats are accessible, but not if the hardware fails and you don't have backups.