Doran's Shield should not be nerfed
Assuming you're constantly harassed, the shield gives 3.2 health per second, 5 bonus physical damage to minions, and 80 health.
Now lets compare that to doran's blade: 80 health (which cancels out with the shield), 3% lifesteal, and 8 ad.
Assuming you have 70 AD, the lifesteal gives 2.1 health per hit. That's about 65% of the health you get doran's shield, but you won't be constantly auto-attacking, so let's assume it gives like 50% of the healing that doran's shield does. However, it also scales much better than the shield. After you get a BF sword (110 total AD) you get 3.3 health per hit -- which is slightly more than the regen from shield (3.2) per second. But then, in addition, it gives 8 ad -- which helps harass, last hit easier, and gives your abilities some scaling.
Now, overall, I would say that puts doran's blade slightly better stat-wise. BUT in the current state, doran's shield gives an additional starting healthpot to compensate. After the nerfs, I fear that doran's shield will just be worse than doran's blade in every way. AGAIN.