You are saying that your kid will be a u14 in 8th grade, right? If that’s the case, a number of EHF u14’s try to hang on for full season. My kid was a freshman at U14 and it seemed like it was a mixed bag for those who stuck around for full season. Some teams lost fewer kids to HS than others. I will say that it is a weird year. Some very strong kids play up on a FS U16 team but those are not that common.
JV hockey outside of bigger regional or at times catholic schools with middle schools is below average hockey and some schools struggle to field a team. Depending on your club and coach, the better option is to stick with them until you are cracking a varsity lineup.