So, apparently Dark Souls 3 will be the last Dark Souls we´ll see, but not necessarily the end of 'Souls like' games, especially since (if I´m not mistaken) the style of these games is the most successful thing From Software has ever made, but after:
"Demons Souls (2009)
Dark Souls (2011)
Dark Souls DLC (2012)
Dark Souls 2 + DLCs (2014)
Dark Souls 2 remastered complete edition and Bloodborne + DLC (2015)
And the upcoming Dark Souls 3 (April this year)"
That´s a lot of Souls...they must be itching to work on something else different, and as a big fan myself, I´m ok with them taking a break from it and going for something different, keep those creative juices flowing.
In time, I surely wouldn´t mind a return to Souls, one with a Sci-Fi thematic would be neat, but after DS3 give me something different.