Yeah, of course. However, this alone would make a major difference to those with slow internet. The installation part should only take 15-30 minutes or something, not the hours people are saying the update takes.Download? Yes. Install? Wouldn't be so sure about that.
You know what happens when you swap firmware files while you're using those firmware files and the differences are substantial? You guessed it - bugs and conflicts. If I were a designer, I would not allow the user to install the firmware while he's playing games - download, why not, but not install.
The installation part should only take 15-30 minutes or something, not the hours people are saying the update takes.