I don't think that would have influence. If you wanted to have many children, there are easier and especially cheaper ways.

The majority of world population wouldn't be able to afford it, even if it got really cheap, like 100USD per clone, only a small percentage of the population could afford it to really have 50 clones, even if it became a trend that would not have a huge effect.

A person can already decide to have more than 10 children in most cases, basically for free, potentially even with monetary benefits (Canada, Europe, ...).

Just have the next big pop star talk about how great it is to have many children and how everybody should do the same.

Or lets have a big debate about the awful effects of overpopulation.