Well I cannot say that 350$ is the new barrier. IMO, if we all sell this coming halving it will be sure to dump hard and in the worst case we can brake that buy wall down and make it go down a lot. On the other hand if we did'nt break it, it would be nice because it means it will rise again.
I have doubt if this is going to happen, as long as there's a buyer who's willing to buy bitcoin. The demand is still there and that doesn't make the price dump so much.