I'm just gonna be rambiling a bit here. Here are my thoughts on what I think about how the pony fandom will fare in 2019.
It isn't a secret the pony fandom has been aging since this is the 9th year that the pony fandom has been in existence. The show itself is ending and with that a lot of the fandom will also probably drop off until G5 becomes a thing. Even after six years, I am still very into ponies. I go onto derpibooru daily to look at pony art, I come here pretty much daily and pretty much all my online profiles around the internet are still ponified. For me, I don't want to change my online persona from ponies because I just feel really comfortable with that.
There really isn't anything at the moment has captured my attention as much as ponies have right now, but when that time comes I will never forget the pony fandom. Yes, we all have to move on one day but my time isn't there yet. My interests of right now mostly center around video games, music, and ponies. If there was anything that would change my internest from ponies, it may as well be music.
I personally don't care about the stigma that being a brony comes with. I enjoy what I enjoy and people who don't like that can just heck off. Ponies have brought me from the brink of suicide many times now and I am very grateful for that.
I am not going to lie though, seeing the pony fandom die off slowly does kill me a bit inside since I am still very interested in ponies and pony related content. Seeing one of my favorite interests slowly die off is disheartening, but I will prevail. When I think about it, I may as well be one of those people who still be very into ponies in the next five years. Unless there is something big that captures my attention by then, I don't think ponies are going to go anywhere for me anytime soon.