I agree with the points you brought up. Someone on Steemit also brought a big point that, "It's now easier to vote for yourself rather than voting for others". His point was that, it will require you to post 10 comments and self-vote. As of now, same member will be required top post 40 comments to use his full voting power for his own use (selfishness)

I'd completely agree with you on 2x voting power as maximum. We should wait and see the effects of linear rewards first than making multiple big changes which could affect the economy in unexpected way.