The most appropriate statement for a facilitator to make would be$,$

Multiple Choice

$$If any of you just want to sit and listen, that$$s fine.$$

$$That$$s one of the silliest ideas I$$ve ever heard.$$

$$Your idea is not very well thought out.$$

$$I ask people not to share unless you$$re convinced your idea is really fresh.$$

$$It sounds like you$$re saying the idea is too expensive to implement.$$