...on the other hand, Mass Effect is a huge tentpole for me personally, as my favourite franchise of this generation. I'd rather see it end now than be subjected to a "new trilogy" situation where I have to start actively decanonizing stuff in my mind. I don't want to be that guy.
I can sympathize with this view.
ME is my favourite franchise of this generation too, by a long distance, so this news both intrigues and terrifies me. On the one hand I wouldn't want the franchise to outstay its welcome, but on the other, I'm nowhere near ready to say goodbye to it all yet.
Personally, Mass Effect is to me in this generation what Final Fantasy was in the last two.