I think it's wrong to see netdecking as a problem. Lots of people don't have a ton of cards and want to invest their dust wisely, lots of people don't enjoy experimenting and theorycrafting, and lots of people quite frankly are not good players and hence have to rely on a familiar powerful deck to climb.
Instead of viewing netdecking as a problem, see it as an opportunity. The more predictable the meta, the easier it is to counter with homebrew. If everyone just played random stuff there would be no room for tech cards and it wouldn't be possible for certain decks to thrive that are built specifically to beat a predictable meta.
That said, balance can be a problem, specifically when decks are both strong and lack easily exploitable weaknesses. I feel like pre-nerf Druid was such a deck, since it was nigh unbeatable unless you played aggro, creating a very narrow meta that is hostile to experimentation. DH on the other hand isn't that bad, aside from an on-curve Drek'thar there is nothing unbeatable about that deck, there are plenty of ways to either out-tempo or out-heal your way to victory.