The Prime Universe sequences took place in 2387, which is a fair number of years after Nemesis.
The latest date in the Alternate Reality created by the Narada's arrival in 2233.04 established on film brings us to 2258, leaving plenty of time to prevent the Hobus star from going Nova.
This thread could be picked up in the next movie, in a subtle way, but the discovery of some kind of volatile, multi-phasic material in the core of the Hobus star, which would indicate an incredible level of energy that if released, would send an energy wave at warp through the Subspace domain, disrupting the fabric of normal Space near areas of large mass, such as Planets, Moons or Stars.