It will help the coins to get some bump on the prices but bullish means it have to be in the upper phase for long term which may not be possible with altcoin as far as I know without the bull run on bitcoin,so we are not going to see anything other than near dump on the prices and vice versa.
So alts usually follow btc price rising? Been reading a lot about this matter and can't find a unifed answer.
Somehow yes, the whole altcoins actually and from the past trades and trends if bitcoin is down altcoins are also going down. The bull for XLM is still far from reality, but this update is huge for them and maybe preparing for a bull. If the supply are lessen and the technology is great like XLM then it will cross the bull trend.