On the All Good Things issue, I always wondered what exactly diverged to allow the Enterprise-D to survive in AGT but be destroyed in canon. I feel that the timing of Data's emotion chip installation is key here. Picard likely told Data how future Professor Data had emotions (Future Data mentioned his housekeeper made him laugh). For whatever reason, this affected the timing of when Data installed his emotion chip. Likely a sense of security that he is destined to have emotions affected when Data decided to install it. As it was in canon, he just happened to install it during the Soran incident, incapacitating him in Soran's abduction of Geordi and leading to the destruction of the Enterprise. In Q's timeline, Data never had foreknowledge of getting emotions in his future. He installed the chip earlier or later--whatever the case, he likely was not incapacitated by emotions at the time of Soran's abduction attempt of Geordi, and the Enterprise was never destroyed.