If a new version of DSD+FL never happens, I feel that I have received FAR beyond the $25 I paid for lifetime updates. It is absolutely one of the cornerstones of my radio monitoring, standalone with FPMA and in conjunction with SDR#. As has happened historically, when and if there is a need to update, I'll wager they'll come along and do so. If not, to me that's fine too.
I have looked at the DSD-FME version but time hasn't allowed me to do anything yet with it. I applaud anyone that has the know-how to expand on this, this is I think the future of scanning. This, OP25, SDRTrunk, UniTrunker, all incredible accomplishments and contributions to the radio hobbyist community.
I think that even if you spend $25 on DSD+FL today and there is never another update, you are getting your money's worth and more.