Not really. I made a thread a bit ago about the effect of winrate on grind time: "Brute forcing" to Legend
Assuming we’re not talking bots or people who don’t need to work for a living, it’s essentially impossible to play more than 240 hours of Hearthstone in a month, and rank resets monthly. Below a certain winrate it just becomes unfeasible given the time given.
But it is true that if you’re merely average or slightly below and you play a lot, you’ll probably make Legend. My point is that if you’re horrible then you won’t have enough time.