This topic comes up from time to time. The answer is that amps still serve a purpose. The reason is that while the "rock band with full FOH support" may still be the predominant playing situation for electric bassists, many of us actually don't play those gigs.
My playing is an example. I play mostly jazz, plus I accompany fiddlers and folk bands from time to time. At a lot of my gigs, the bass is the only amplified instrument on stage. Even when bands have PA support, it's often a small PA that's only sufficient to support a vocalist or wind instrument, and not the bass.
Also, I play with multiple bands, and it doesn't make sense to work out the details of how the bass is going to be supported, with every band that hires me. Sometimes the bandleader doesn't even know how it's going to work out when they book me. There's rarely time for a sound check. There's no way to divide the cost of equipping a PA among the band members when they're all hired guns.
Outside of the rock / pop circuit, a lot of bands are looking for ways to perform in venues where there might not be space for a full PA.
The practical solution is for the amplified instruments (bass, and usually keys or guitar) to show up with a small amp that will take care of any situation. Right now it's a GK MB200 head and a homemade 8" cab. Or I can throw my 12" in the car if it's going to be really loud, which I hope it isn't. I can arrive 15 minutes before down beat and be ready to go.