The cost is decreasing quickly, mostly because the labs stopped competing on quality. At the same time, the costs are enormous, and all labs are very openly subsidizing usage hoping to get enough scale to be profitable (while 1 of them has suspicious unity numbers and can be hiding negative marginal income).

Also, it's impossible that they become cheaper than specialized software. Or even as cheap as them. It's still possible that they become cheap enough that it doesn't matter.