You never know how the consumers are going to react, but, in my group of friends, all of them that haven't bought a next gen console, and they are now decided to buy an Xbox console when the collection is released. i think this collection shouldnt be put in the same category as a previous HD remakes, because of the Multiplayer, if this collection does good, expect a CoD collection to appear.
I do think that Halo collection is going to surprise regarding sales, and while its going to help sell some Xbox Ones, I doubt it is going to catch up to the PS4 (heck Im a halo fan, but I want to play multiplats on the console where they look/play better)
That sounds like my friends too. So far, only one has a new gen console and he got an Xbox. After that Halo collection was announced I've heard "time to get that new Xbox" a bunch from them. I try to tell them about the power difference between the PS4 and XO but they don't seem to care. Last gen I was the lone PS3 owner in my circle so online gaming with them was nonexistent and that factor has me leaning towards MS. I do love Sony exclusives though so I know I'll have to have a PS at some point.