Dynamic income:
I disproved both your points in this very thread:
EM rushes are more popular than EM/Denial stalls, changing the reward system wouldn't change the deck-type composition in arena in arena because it is heavily based on win-rate
And dynamic income in no way suggests that income will be noticeably increased. Dynamic income might as well decrease "auto-income"
Ok, i read through the whole thread again to understand your argumentation. I must have missed centrals points...
a) I disagree with marked part above: If the amount of Electrum/Rating is dependent on the HP arena decks
will change. Atm, the decks are optimized for winning...if your change would be introduced, that would shift to max HP/EM...
b) If you are convinced, that arena decks wouldnt change: Why implementing it at all? Please state as clear as possible the impact you would expect from this change...
Restricted HP and Dex:
Need is because there is no clear gap between gold and silver decks other than overcrowding in gold pushes more bad decks out of arena, while the rewards differ greatly. In addition, skill points don't restrict "player choices" at all, they expand the choices.
Pushing bad decks (well, rather not optimized) out of arena is not bad imho...and while it is true that skill points expand players choices, they are still limited...you have to decide where to put your points, unless your high in platinum...you have to make a choice: if you want high HP AND Dex, you have to go with single mark or few upped cards...fine with me. As there is a choice to make, skill points achieve a certain restriction.
Imho, you dont really need a gap between gold and silver...its already there. Take jmdt classic for example...while it regularly beats most silver decks (my winning % is about 80-90%), it has some problems with gold decks (my personal record is 51-48, so about 50%).
Sideboard:
Again, I am not a professional game designer, so I wouldn't know the exact values for an optimal, balanced sideboard. Don't vote for the implementation of the example, vote on the implementation of the concept.
Even if the number was lowered, i am not sure if this would be a good idea...mostly because this would be a change that favored certain kinds of decks again. --> Rainbows...see the example given by blue priest. Furthermore, any size of sideboard would make the MUCH easier...you gain A LOT flexibility without having to sacrifice anything...