There has recently been a lot of talk about how walls are becoming too useless - the creation of the jump spell, hog riders, wall breakers and the many flying units have deemed them futile in defending villages. Together with the huge costs of upgrading all of the walls, many players have been frustrated as they try to upgrade their aerial defences, which are expensive, because they are the only defences against flying units.
So I am proposing several possible solutions:
a) Make 'high walls', blocking hog riders from jumping them. There would be an upgraded version of the jump spell exclusively for these walls. They would have slightly higher HP, but higher costs. Still though, these would not block dragons etc. Possibly, they could block healers. Upgrades make these more versatile.
b) Make 'force fields', creating transparent strips of 'force', blocking dragons and balloons from coming through. Underneath these strips would be 'force pod', creating these fields. Attacking these with ground troops would destroy these, but still aerial troops could alternatively attack the strips themselves (this method takes more time). These defences don't block ground troops. Also, the healers' spells may not be able to penetrate. Upgrading makes these stronger, and possibly eventually have electricity running through them, slightly damaging a unit if it collides.
c) Spiked walls. They are very similar to the aforementioned 'high walls'. Instead of being separate walls themselves, a spike 'add-on' could be bought to an existing wall. If any troop attempts to hop over these walls, the spike creates a small explosion and damages the unit considerably, and blocks it from crossing. However, these spikes, once exploded, will need to be bought again, or re-armed. If the wall itself is destroyed, the spikes are destroyed as well. If a whole row of walls have spikes, then if one of them explode, it will create a 'domino' or chain reaction, blowing up the other spikes as well. To balance, only 5-10 spikes are available each town hall level. Upgrades mean more range and power.
Thanks for reading; I am new to these forums, so sorry if I posted a already-posted or a crossed out idea!
These are some quite elaborate and well structured ideas you have although I think you should add a 4th vote option, "Walls are fine as they are" - I think many people around will argue that walls are fine as they are.
I'm particularly happy to see that someone on their first post has thought their idea through and added some structure to the text, but I think many people would be quite unhappy if these changes were to go live (which is natural, there is no pleasing everyone, is there?).
Spiked walls or walls with some form of DPS have been proposed before, but the general consensus has been that it would be to OP, aiming to counter one specific unit (hogs), making it useless - which is in itself debatable. Walls that make the space above them unpassable to air units would also take away a lot of the potential that air units now have - and they were, after all, designed to behave in the way they do, which is hover above the bases and bring death and destruction from above. I for one think that high level walls are already nice as they are, I'm currently working on level 9 walls (~50% done) and I feel they add some nice and much needed defense versus many army comps, especially with good trap and tesla placement to take care of WBs. Hogs are somewhat of a nuiscence, but since I'm using an anti-hog layout they are pretty managable although I'm not yet TH10. I also like the aesthetics of my walls, I feel they add a certain something to the base - and they're also good to pour gold into when you're filling up or don't have anything left to upgrade.
That said, I think walls are fine as they are, and although some bonus like some of the ones you've described would be nice to have, I think many people would argue that they are too overpowered.
Again, welcome to the forums, and keep up the good quality posts and ideas
/Rastis
edit: Oh I forgot to add - If there was a 4th option about walls being fine the way they are that would be my vote, but from these ideas I'm leaning towards C, the spikes. Need to give it some thought, though.
although I think you should add a 4th vote option, "Walls are fine as they are" - I think many people around will argue that walls are fine as they are. 
