If anything, MS's decision to start taking Bitcoin again will end up helping it rise in price. They reinstated BTC payments.
It won't do that much for the price. Thing is that Microsoft has done the same more than a year ago, where people were worried about why they did remove Bitcoin as payment option, but Microsoft then stated that it was a mistake from their side after many complaints. It would only have had an impact if people were actually using Bitcoin to pay for things on a massive scale, and that's not really the case, otherwise Microsoft wouldn't even consider to *temporarily* remove Bitcoin as payment option. What doesn't contribute towards growth, can't be missed when removed.
This is normal, Bitcoin can not constantly grow in price. Buyers should sell Bitcoin and make a profit, then again start buying at a bargain price.