I think they certainly have to prove to people why they should care about Gears still but releasing a remaster that was functional at a basic level will at least not hinder them.
Notice how the beta access with Gears mentions "early access" with the console bundles and Gears UE rather than just access, I think they are going to do their best to prove they're not going to do a Halo 4 with the multiplayer and if they make something compelling with the multiplayer and Horde that will certainly see it do well.
What is the biggest draw for Gears, the SP/MP or is it about an even split? I said this before but with a game like Gears you just need that splashy E3 demo which will blow peoples minds, coupled with a great marketing campaign with Mad World type ads and it should do fine. Or I could be completely wrong and it could fail commercially, much like I am expecting the new God of War to as maybe not enough people care anymore.
Before God of War fans jump on my back, this is just my prediction which could be way off.