In the end, it is really an all or nothing system. All States need to change to the split the vote ticket (or at least the big ones) or none. If only NY, CA, Ill or traditionally FL changed to a split system without the rest, the Democrat party will not see a President for a long time. Doing a half and half system is a Receipt for problems.
In order to change the EC, it would require a change to the Constitution, which would take the choice away from the States. I believe the Federal Government already dictates too much to the States as it is. No change IMO is needed. If a States wants to water down its vote, let it (I personally wish CA would), that is their choice.
That's My Short Two Cents