There's talk of naming the mystery planet David Bowie. If it turns out to be a blackhole, that'd be even better.
But that would be as unlikely as finding a unicorn in your backyard. A blackhole would be so useful to us. Not just for the chance to study a blackhole, but also for many practical uses, like energy production and studying quantum gravity.
Maybe we could even use it to sling probes all over the place.