They would have to possibility to capture the other Tech Plants, right, but do you really think that capturing a facility, somewhere deep within the enemy territory, would be that easy? Remember how hard it already often is to capture the big facilities when you have a secured base nearby and some zerg with you to attack. You would ONLY have the possibilty to capture it by those links without having any outpost nearby and without bringing any zerg that growed big and fat while they've captured several other bases before on that lane! I don't think it would be that easy as you maybe imagine but it would open a few new possibilities to the game together with a few now routes that could theoretical be used to capture some critical areas within the enemies backyard. Players would try to make use of one of those lanes and others would need to defend those areas but every single one of those attackers and defenders wouldn't run his HE Lightning within one of the big zergs! That's the basic idea behind it.