over the years number of cards that produces value increased too much that 30 hp is not enough anymore that started to limit discovery of new archetypes and with the addition of demon hunter it took a new turn. I think they should increase the base hp of all heroes so we get more space to try new decks.
Are you kidding? As someone who has played just about every Reno deck imaginable (only haven't done DH, Shaman or Druid, I believe), I can promise you Reno is not even close to broken. Early, consistent pressure makes it very hard on Reno decks: they start running out of answers for threats and end up having to a) hope they draw Reno; AND b) draw something that lets them regain the board. Drawing Reno alone will only drag the game out. It'll rarely change the outcome.
Now, if you're some brain dead face deck that vomits out your cards and starts topdecking on turn 6 AND your opponent has Reno or a board clear,yes, you're doomed. But that's your own fault for overextending your board.