My hubby lost his job and now games 7 days a week on twitch. He tells me one day he will make it big and become a millionaire. Quite ridiculous?

I have no idea what twitch is, but i feel, before anyone pursue their unrealistic passion, they first need to be able to self support

Give him a time limit. Most successful twitch streamers make it within a year to two. If he is still adamant, negotiate with him about a time limit to make it big. Else, it's time to come back to reality.