Hopefully something a little more constructive...
In my opinion,
Your two summoner spells are your bonuses. You make that decision of what you need. Most people choose flash because it is able to be used as bot an engage or a disengage. I rarely choose flash with anyone but Alistar. I would rather have Heal for early game sustain & baiting, ignite to finish off a close fight, teleport for surprise ganks. If I were now able to have Flash, Heal and Ignite that would be way too epic.
Situation...
Your suggestion...
Both champions are finish a fight and both are left with 100hp. I could heal, ignite, flash out. Or flash in, ignite, heal. This would be a low risk completion to the fight.
As it stands how it is now it retains having to make calculated risks without the reliance on 3 summoners.