If its what I think they're going to do (reputation detaction Ala IE9) it won't help much. See my sig if you want to go more in depth as to why.
Besides, The biggest Threats are the following
1) Malicious Forked Open Source Software
2) Installers with Bundled Adware
for #1: look at VLC. there's so many malicious forks of this I can't even count them. Many times they're just Renames, but other times they have more adware and spyware Embeeded in them than I can count. Hell One I found Shows ads before you watch any video.
Another example is "Fast Browser" which is a chromium browser fork with spyware baked in. it looks exactly like chrome and the only difference I can tell is the Icon (which rips off the chrome Icon, only Square) and the name in the about box.
for #2. Lets do a search for VLC and highlight any download site that's not from videolan.org or sourceforge (although I should count sourceforge. they're doing this too now) (obfuscated to avoid clicking)
os-downloads,com ..and these are just the results from 1st page direct searches or ads from bing and google alone.
I can all but guarantee that downloading anything from the above sites will get you some Potentially unwanted program or virus. I just wish that someone would make an Adblock plus list like the malware domain list for fake downloading sites.
Now I know that it sounds like I'm Picking on VLC here, but it's just one of the more hijacked examples. You can do this with just about any popular Program. Firefox, Chrome, 7zip, Openoffice, Minecraft, even IE10 and Windows Media Player have software wrappers.
Hell. Even the Microsoft Store in WIndows 8 isn't safe. Do a search for VLC there and the first or second hit is a link to getdesktopapp,com which piles on the junkware. when you look at the app's Publisher. he's doing the same thing with peazip, 7zip UMPlayer and openoffice.
If Chrome does something about these software wrappers then were talking, otherwise it's nothing new from what they were doing before or what IE's been doing for years, and that hasn't stopped anything either.