NBC press release:
Only worry with "all live" is when there's a stack of 3+ games on at the same time that you might want to watch. Fox currently does replays where it's easy to dvr 2 games that are on at the same time, and dvr a 3rd later.
I don't run into that a lot. What I do run into is that my dvr forces me to watch one of the channels if I'm taping 2 events at the same time. Can run into issues when the College Football season lines up with the EPL season, and a football game that I need to watch is on at 12 ET / 9 PT at the same time as two futbol games I want to watch/tape. Fox made it pretty easy just to dvr later.
Overall, though, it's clear that NBC is committed to cover the sport.