that's part of the point - a sport already trying to speed things up in light of waning popularity needs to find a way to avoid having games go on indefinitely. there's something endearing about a sport without a clock, but it'll mean the death/serious decline of baseball if they don't change it.
Not sure how you would do it, but tennis ended the super long set play situation with a tie-breaker action. Hockey too, with the 3 on 3, 5 minute period, and then a shoot-out. Might be harder for a good baseball solution, even to keep it for playoff games.