Every day that Bitcoin's dominance rises or at least stays at this high levels shatters the confidence of altcoin holders - I visit /r/cryptocurrency from time to time and they are so depressed at the moment. Some people still try to shill for shitcoins like IOTA or NEO, but they don't get as much support as they did in the past. If a miracle won't occur for altcoins, they might spiral into lower depths. So at least now new money that enter the crypto market will go to Bitcoin, although this could have been always the case, as people had to buy Bitcoin in order to buy alts. So, this whole thing won't affect Bitcoin too much.