i guess it kind of depends

Now if you are saying to get 8 pros together to play monobattles just for the fun and entertainment, that would be awesome and so much fun to watch, however, im sure it would be hard to fit into the pros schedules unfortunately. Now if you mean as a form of competition, theres no reason it couldnt be possible, like matsu said there would probably have to be more restrictions, and a more concrete set of rules, although if its 4v4, people picking tier 1 units or tier 3 units should be a problem since the teams can work out a strategy. either way, this would be awesome to see :]