The 2-year home residency requirement for J-1 holders only applies in case of IVs and NIVs in categories H, K and L. There is no automatic loss of eligibility for VWP travelers, or indeed B1/B2 travelers. However, you will still need to demonstrate ties to home country to qualify for the VWP, and this will be difficult (but not impossible) if you have been on a J-1 in the USA for the last few years.