Better and better indeed, maybe even up to a point we can't tell any difference anymore. When AI's are so realistic, that you're not able to see the difference between human and robot anymore. Maybe in the future people even start getting relationships with AI's.

How much AI's can talk, think and act like humans in the future, I don't know. Our lives are probably too short to experience this evolvement. But if AI's will ever be that human-like, we could produce one to perfectly match a persons wishes. And as humans will get used to them, they could fall in love with the AI's looks and personality. It would probably take many generations for this to become accepted (if it ever will be), but it can happen I guess. For a very long time homosexuals, transsexuals, etc. were also not accepted.

Luckily we live in a time that this is becoming wildly accepted. It's a process that doesn't happen in a couple of years, but in a future world were we all live amongst AI's, the acception could happen right? Even though it might be unthinkable to have a relationship with an AI at this time, people in the past thought the same thing about homosexuality at that time.