Right now, with all the great redstone blocks we have, I think there are two big flaws still in redstoning in general that can be fixed up with a specific feature and a specific block.
First up, switchable redstone torches. Pretty much what it says. If you left click a redstone torch, it should turn to the inactive state. At that point it wouldn't power a redstone wire or component nearby. However, if you power up the block it's on, it will also power up. Makes sense, and is totally optional and won't harm any current redstone projects, but can potentially make current ones easier.
The second one is what feels like the last frontier of redstoning, which is the vertical "wire". Right now, you either need to deal with many redstone torches on top of each other, which only ends up working upwards anyway, or you need a long line of observers, at which point they only do one tick of redstone power at the end point and only at full 15 power.
I propose a new block... The Redstone LASER!!!
Firstly, you can place the laser up or down or on the side to save redstone wire. It will start off, and can be powered like a normal redstone component block (Dropper, Dispenser, Pistons). When turned on, a laser of signal strength 15 will be shot out. It is harmless to everyone and will gradually lose signal strength per block traveled. It's also a constant signal.
The biggest uses of the laser are twofold. Firstly, the first non-transparent block that the laser hits will be powered up, whether it's a normal block or a redstone wire/component. Secondly, the laser itself does not cause any signal on any adjacent blocks, making it effectively a consistent "observer wire line".
But say you want a pillar of wiring similar to the redstone torch ladder that has multiple redstone wires per level. Well the laser block itself not only receives power from any angle, but if a laser block also is powered by an adjacent laser block, then that laser block will power up all adjacent blocks only on the sides of the block that do not have the input and output, meaning you can make a laser block line that can send out a redstone signal on every single level of a vertical wire. The only caveat for this functionality is that the input for the power of the laser block MUST be another laser block.
What do you guys think? I think these two things will effectively solve all redstone logistical troubles... maybe.