Since the new shield wall gives block value, I was thinking that maybe block could become a little like mindslayers shields.
Spectral shield could be implemented into base block and block values lowered (a lot). This way, only bulwarks would be able to make the flat damage reduction on block a good defensive tool and with the right scaling it could be decent from start to finish.
Now, to give bulwkark something similar to forcefield, last-stand could also raise your block value. By similar, I don't really mean 60% damage reduction, just a buff to how much incoming damage you can mitigate!
This way, taking eternal guard at lvl 30 would be a great option, in line with the fact that they are "the shield class", giving you something very similar to TK shields (since thanks to eternal guard your block is almost always on).
This would hurt demonologists a lot, but that could be easily solved by adjusting the numbers on osmosis shield to make as good as it is now (i.e. 100-150% of block value, based on how much block values get lowered).
Just an idea, cheers!