There are lots of amateur photographers out there that use Apple hardware yet so far Apple only monetizes storage. I wouldn't be surprised to see a subscription offering that includes pro tier features for Photos.app good enough to replace Lightroom for enthusiasts but not for actual professionals.
99% chance it will not stay alive for more than 1-2 years. Shazam is the only Apple acquisition I know of that still exists independently, and that's only because it promotes Apple Music on Android.
Most likely will be integrated into Photos or possibly even a new advanced photo editing app for macOS/iOS only.
Since they were already Apple hardware only apps, there is a good chance not much will change about it (at least in the near term) and they will just use it as a tool to increase the desirability of their hardware, just like they do for their iWork suite.
I don't think it bodes well for the long term though, because Apple tend to not care much about stuff that don't make them a ton of money.
It will probably become like their office apps, being updated at a glacial pace, used primarily as a marketing tool but never really reaching a level that would truly make them a worthwhile competitor.
