If GRAM coin goes live during this autumn, at the same time while Bakkt exchange would go live, it will give a huge boost not only to BTC but to the whole market in general. An on the raising market any coin can easily make x5, and I am not speaking about one of the most awaited coins of 2019.
Not sure how much interest there will be in Gram, as once markets gain liquidity, early buyers can dump and make a decent profit. But if the price holds up, it may boost the markets... just not sure if it'll go to BTC or to alts, or both.
There could some interest because telegram did played a huge role in the ICO or IEOs, when most project use it as their public address medium, telegram has been considered to be crypto related since onset, that gives it a edge over libra coin.