They said that Mark Zuckerburg's coin will be released before the second half of this year so my guess is if that really happens and there is a positive response from the world then it will be the start of a bullrun for sure. Just imagine if they use that FB coin for the ads in their platform then that will make that skycrocket in days.
I doubt FB coin will have an impact on the bullishness of the crypto markets. Lately, all crypto markets whether Bitcoin or any assorted altcoin have the same price action.
I actually believe FB'c crypto project will mainly help the market through more publicity, more eyeballs on the whole industry.