Oh the Dev team is fully aware of that, one look at the story cinematics (with the character of Deimos) the team has released starting a year ago will make that very clear.
Not to mention with the absolute BANGER that was the Six Invitational tournament which has just ended (Seriously, watch the grand final highlights whenever they come out), the popularity of the R6 franchise may just skyrocket and outgrow its legacy.
Rainbow Six Siege director says making a sequel after 9 years would be a mistake: 'I'm not going to name names, but you see games go through sequels and just completely drop the ball' (www.pcgamer.com)