being willing to experiment and try new things is probably pretty good to long-term stability, I'd guess, particularly in a competitive and changing market like the one MTG exists within.
doodle cricketA lot of the kinds of things you're talking about (unbalanced cards, ban waves, people not liking the stylistic direction the game is going in, people not liking the direction the story is going in, messing with format structures, mismanaging the competitive scene) are also things that people have been complaining about for as long as i've been playing magic (~15 years) and I'd wager a while before then too.
I am primarily considering the outcome of the D&D Edition Wars. Despite its flaws, the third version was well-received. Regardless of how one views the game, the fourth edition was an attempt to expand under duress to untapped regions and achieve growth that they eventually failed to achieve. While managing to reach a far wider audience, 5th Edition mainly reverted most game design ideas to items that the players who fled to Pathfinder in the dark times enjoyed. Recently, the whip broke once again, resulting in yet another misuse; but, that is a different story.