>>58161634
As an experienced shace card-anon:

unironically - yes. Just buy it now.
What can happen?

1) It will go up just like moonbreon. Only up and up.
2) IF (if) the market crashes - buy another one because it will climb up very quickly after that.

Bubble Mew is a 100% established chase card. It will __forever__ be a chase card just like Moonbreon, Giratina or Mega Gengar.
It's only up from now on.
And even if it will dunk a bit - there will be no reason to worry about because pokemon card collecting hobby is not gonna die any time soon.