Yes, of course there will be a dump but not yet. First , we probably won't reach 600$ (not anytime before the halving) and same goes for the dump , It will happen after the halving block reward when the price may reach 1000$ if not more ... then the PANIC starts and everyone sells.
i think dump will happen to shake weak hands. Price will be arround 550 and thats new 430 like not long time ago.
Halving will bring new highs and bubble but first weak hands will be empty handed so whales can profit most.