That's really a BIG issue with all the Google services. In case something wrong happens with your Google account, it's like you lose your email, your mobile device (if Android-based) whatever data you are storing, whatever data you are sharing (youtube account and pictures, photos), etc... the implications are far-reaching. For me, this centralization of services also become a deal-breaker. All accounts should be clearly separated by services, if not the risk of loss in case of failure is just too great.