Here's a few ideas based off what I've heard and experienced...
1) Give the ability to select all towers and move them as a whole in the base edit page.
Yes, This idea is great 
2) New trap: Lightning Rod. Just like the spring traps, they don't have upgrades and only work with lightning spells. If lightning goes off anywhere near them, it will attract the entire attack for a 3 second duration. 1 can be gained at TH9 and the 2nd at TH10.
Uhh... I don't think so...
3) Hidden loot. I know this would annoy a lot of people but hear me out on it. So many people skip over others when they have small loot to be gained (as do I), but if Super Cell would make it so that the amount of loot is hidden until one watches the replay, would add more attacks and more skill to search for them.
Umm... I don't think this would help...
4) Being able to use the Hero's ability during defense. With CoC notifying us when we are attacked, I'd like to be able to use our Heroes' abilities only if we are watching the replay live. It would make things interesting for attackers to know they are being watched.
5) Since the Dragon is irrelevant TH9/10, I'd like to request bigger boost between Dragons LV 3 and 4. Since LV 4 is only at TH10, it would make them relevant again.
I think they should just add a drag lvl 5 
6) Weekly random missions on the Campain Map. Easily can be made to have bonus missions that only last for a week at a time.
This thread here basically the same idea but more detailed.
7) The ability to see our clan member's active war base when not in a war. I have heard this is already there but have yet to see it.
I like this idea
This has yet to be implemented btw
8) Change in how gems buy gold and elixir. I have no problem with 260 gems per 24 hours, but the gold and elixir amount is far too low.
This is how SC wants it. I guess they need this much to make enough money to come up with and program new stuff
9) Another Hero. A lot of people have asked for it, but I think it should be with a dark troop. Possibly a minion hero since it's the lowest DE troop and it would give a flying hero.
Yea... This is the ruled out ideas thread. I like the minion thing though 
10) Just as a side note, I really like the new War updates that SuperCell added.
I like them too 