Aperture still works and was even just updated by Apple for Mavericks and Yosemite (but I am not updating to Yosemite for some months). No rush to update Aperture to any other program like a crazed maniac. Take a year to learn your options, try them out. Keep using Aperture since, it works and all your data is (presumably) kept by it.
Right now, the best pro future replacement options for Aperture (I am not rushing), are between DxO Optics Pro vs Capture One Pro vs Lightroom (I hate that Adobe subscription model, which would knock Adobe out if that becomes the only version updated in the next year).
There are also a few more (ACDsee - good price now, etc.) but the RAW conversion is not as good or price too high or DAM function less powerful, etc. Capture One Pro was and is probably the most “pro” replacement to look at and try. All of these have free trials. Many also have student pricing for photo majors but, you may have to buy direct for the discount or (in the case of Capture One Pro) only via a reseller (who does the discount).Keep in mind that the RAW converters and features in these are constantly being improved so, some might jump ahead or fall back then come back on top. Also, some is personal preference. Most pros seem to like Capture One Pro RAW converted images over all others. But some pros still use Lightroom or other programs for file management. Some pros use a dedicated RAW converter (like the free one from Nikon or other) and the rest is less important for them.
I forgot, there is also the free program for management and RAW conversion that comes with Canon, Nikon and other brands. But, usually, these are not as good as a third party with the exception of RAW conversion. Usually, they are superior. But the other issues with it, UI, UX, crashing, etc. make them not worth it.
The exception is the free Capture One Pro for Sony camera users. If I shot only Sony, that is an incredible deal!
Note that Capture One Pro was the first with a way to move your Aperture (and Lightroom!) collection into Capture One Pro. Weeks later, Adobe also offers this option of moving Aperture into Lightroom.
In the mean time, I use Google Nik, Perfect Effects, and other plug ins for processing in Aperture and they work great. So Aperture mostly continues working for me as a file managementprogram or DAM.
Oh, and Apple Photos is another option. But, that is also a wait and see. Will it be be robust enough for pros? Word is, no. But for enthusiasts, it could be great and free!