I wonder the same thing. The new miners will generate lots of trades. Lots of trades can equal volatility, volatility could be good. Or bad. But market volume should generate interest from chart traders if nothing else?.!
Thousands of new asic miners immediately dumping their mined Sia for BTC - well I don't think the price will get worse but I don't see it rocketing. Historically a coin price hasn't gotten worse when a new asic released for it.
If anything you'd want to buy BTC since that's what all the Sia miners want to end up with.
We're also in a weird, not quite bull nor bear market, so there are probably better coins with more potential to invest your next $500 than Sia.