Whatever you do, don't dust other classes. This would be a really stupid idea and absolutely ineffective in dust value if you want to build a collection. There will come a time that you get bored of your single competetive deck and you will have no basis in the other classes to build on. Dust bad cards, dust golden cards of which you have the regular ones. Maybe rares can be dusted if you really need the last 100 dust.
But do not dust all cards just because they are in a class you are not playing currently. Especially not good legendaries or epics because thesy will cost you a fortune to get them back.
If there is something you want to have, like Aya or Kun, craft it. You have enough dust to spend it for good cards that improve your deck and having more fun now is a good reason to craft a card. However, spending dust just because you have it is no good reason. Generally keeping the dust is good advice, since the meta will change with the upcoming expansion and so you can easier adjust.
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Here's a video of what is absolutely the worst play I've ever seen in arena (full disclosure, video is mine). He threw away 4 cards including the coin on the first turn! What's the worst play you've ever seen?
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Lol, if you can't get past rank 16 with this deck, the problem is _not_ the deck. Look within, my friend.
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My biggest point about the nerfs (see video in my signature) is that, while sometimes Blizzard makes reasonable nerfs that allow a card to still be played (Soulfire, Spreading Plague), quite often they nerf cards so hard that the cards are never played, effectively banning them (Starving Buzzard, Warsong Commander, Arcane Golem) in both Wild and Standard. I would prefer, instead of nerfing, Blizzard to just HoF or otherwise ban these cards from standard, but allow them into Wild unchanged, so the cards and the decks they enabled can still be played. To me, that's what Wild is about -- being able to play powerful cards and decks that are no longer allowed in standard (due to rotation or power level issues). I'm OK with Wild being comparatively high power to standard.
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Stay with Aggro Paladin. Cut Val'anyr for Spellbreaker or Truesilver Champion. The meta is like 8 percent Warlock, you accept those losses(though its still winnable) and move on. THe meta is like 30% Priest, which your deck is good against.
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I drafted a Paladin w/Call to Arms. Good card, yeah?
Well, my only targets are Grimestreet Informant, Grimestreet Outfitter, Ravasaur Runt.
"4 mana: Get a 1/1, a 1/1, and a 2/2, unless you drew any of them first, plus you really want to use the battlecry on all of them". Feels bad, man.
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https://en.wikipedia.org/wiki/Variance
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Kingsbane is a great card that does not have a home in Standard currently.