The significance of breaching the $30K area is that it supported price for around 18 months, so while "traditionally" it should act as new resistance, if it doesn't, then it's true that further upside towards $50K becomes increasingly likely. I wouldn't quite compare it to 2021 however, but more so like 2019 when price breached $6K previous support level (that failed to act as any resistance what so ever).
Many people will say that "this time is different because of X,Y,Z", and while it's true that it could be, so far everyone about Bitcoin's movement since the start of the year have replicated 2019 strong recovery, rather than 2015 style consolidation near the lows. This obviously doesn't mean it has to continue to recover by increasing 4x in price from the lows, only that so far after a few months it's following suit.
I am not entirely sure if the resistance will be there right away, it may require us to stay above 30k for a long time before we could get there, but if we go above 30k and spend at least 3 months there, then it would be pretty close to impossible for us to get back down. Of course it still could get back down, like it always crashes, but that doesn't mean that it will be easy, just like how we haven't fallen under 20k for a while now, it could be the same for 30k as well.
But, first we need to go above it and we aren't there just yet. So the discussion for what happens after 30k is breached is a discussion for another day, and we should focus on this current price not to fall and just goes up.