I am not a big fan of tiebreakers and certainly not in the fifth set of a GS match but I can see why people want to have a tiebreak in the fifth. I thoroughly enjoyed yesterday's match and personally can't relate to the feeling that a match should end just because there's another match after that which the crowd wants to watch more.
But I guess it would be good for business if they have a tiebreak after 10 all or 12 all in the fifth.
Yes, I do, but do I enjoy watching 2 players play 8 sets worth of it in one sitting? No. I wouldn't want to watch my two favourites of all time play 8 sets worth of tennis in one go. That's just stupid, especially as it's not a final, and you still have rounds afterwards to play.
As for determining when a 5th breaker should be implemented there is obviously no right answer. I think most people say 12-12, which essentially and not unreasonably means you play 2 sets worth of games, and if one person still can't finish the other off by that point then you just cut to the chase.