We would not say this. I agree with Steven: it's acceptable grammatically, but it's conceptually rather odd. This is because 'plenty' is a wholly positive concept, so we can't make it negative.
You could say 'I'll never have much money" or "I'll never have a lot of money" or "I'll never have a great deal of money" or "I'll never have enough money [to do something]", but not 'plenty'.
Many students learn 'plenty of' alongside all the other quantifiers (much, many, a lot and so on) assume that it's a synonym and that it works the same way. In fact, that's not the case. 'Plenty' means 'more than enough', so it is not a concept that you can make negative.