I already have bought a few pieces under the $500 threshold and personally will buy tons of it ever dips below $250. I don't see that happening, but as I stayed true to my word about acquiring Ethereum under $500, I will do the same if it breaches $250.
Yes, it is impossible to reach below 300$ because people are buying ETH when the price of ETH below 450$. Now ETH price is kept increasing and it is more than 500$ now it is impossible to reach below 250$.