Some background first. As i understand it blizzards aims with talents where along the lines of:
1. For a talent to be useful and provide uniqueness
2. To be a choice
The change to blessed life allowing it to proc once every 2 seconds to once every 8 seconds is somewhat against this.
Blessed life is a 2 point talent. If 1 person is attacking you then you have a very high probability of this talent procing with only 1 point invested. As more things attack you the second point in this talent becomes more and more worthless as the probability of it not procing on just 1 talent point becomes exceedingly low. This is against the principal ideas of talent trees. In effect the the second talent point becomes weaker and weaker when more things attack you. In effect this is now a 1 point talent as there is no reason to invest a second point
In PVP healers already have a very hard time, there are several addons that allow automatic marking of healers which just lead to be zerged as first target everytime, spending half your time in the GY is hardly fun
My suggestion for a better change:
1. Revert back to 2 seconds
2. Reduce probability to 12% for 1 point and 25% for 2 points, these can of course be modified up or down.
The above then gives meaning to a 2 point talent and would make the talent stronger if zerged by mulitple players in a pvp situation rarther than weaker.
The above isnt really a huge change however something i would like to see which is maybe a bit more out there is allow healers in pvp to survive the charaterisitc zerg, im talking about all healers here. However this should come with a consequence which would mean we could steam role anyone in a 1v1 situation. As such there could be a secondry effect to blessed life such as when blessed life procs then you can not inflict any damadge for 2 seconds but the percentage of proc would also be higher. This would lead to good survivability but would also lock you out from actually hurting anyone else. This would then give people an option as to if they want to spec into this talent at all. Yes we would have to make a choice as to if we want survivability or also some damadge potential, choice is good and i thought a core aim.
regards
Rammsey