What does the future of the weather radars look like?
In the USA, planes with ADS-B can receive FAA transmitted weather from ground stations for display in the cockpit. It can lag by several minutes.
https://www.faa.gov/nextgen/programs/adsb/pilot/

Planes with XM weather can receive more timely weather from satellite feed for display in the cockpit.

Airborne radar has the advantage of being the most immediate, but you may not be able to see much past what is immediately in front of you, so combining that with ground/satellite feed to give you a view of what is farther ahead would be the best of both.

I have ADS-B in my plane, but I don't do any extreme weather flying, just climbing thru cloud layers to get to nicer weather on top, or dropping thru a layer to land. I'm not out there trying to dodge thunderstorms and heavy rainstorms. If the weather is that bad, I can wait it out.