L1A Extension and stay in US

[dris]

I am in the first 3 years of L1A visa valid until Feb 2019. However my employer, depending upon the company's performance/growth may or may not apply for L1A extension in Feb19. However my kids who are US citizens and attending primary/middle school will be half way in their school year by Feb-19. My questions are (1) If the extension is not applied, is there any way to continue to stay (change of status) till Jun19 when the school year will end. (2) If the extension is applied in Feb19 I understand it'll allow me to stay till we get a decision on the extension. If for some reason the extension is not approved, does it have any impact on any future L1 or H1 visa application?
Appreciate your help and advice