I'm all for giving users what they need, but this sort of shotgun approach doesn't appeal to me. I don't want to throw things at my forum, hoping that some of the users might use them. Most people are like us, they turn off most or all push notifications because there are just too many. And most notifications don't provide the information needed to decide if you should act on them, so they end up just being more noise we can all do without. Why would we want our forums to add to that noise? What users want and like changes constantly. I don't think you can ever get ahead by chasing whatever technology or feature is the darling of the day. Behind all of it is the true need: people wanting to communicate, to discuss things, with other like-minded people. Providing good content and a good environment in which to have those discussions will always be of top importance.