Fountain in URF should instakill

Just a thought, but fountain tower should instakill anyone/thing that goes onto it in URF. So many times i've had an entire team run onto it and kill my entire team and 3 or 4 of them make it off alive because fountain just isn't that imposing. In URF 1k damage a second is honestly nothing compared to what an entire team can put out in the same time. We lose a team fight and the enemy team takes down as many towers as they can and then runs up to fountain waiting for us to respawn so they can all rush it and kill us then run back to the towers that aren't even in our base to take them down, rinse and repeat until they have won. and are both examples of champs that can sit at spawn, wait for people to respawn, instakill them AND make it off of fountain before they have even taken 1k damage. meanwhile their team is destroying every tower we have. What are your guys thoughts?