That's what BOTW 2 (or the next Zelda) is for.
But why wait 3-4 years (or longer) when you can have more this year?
For me? Personally, the main game is enough. That and I idealistically am opposed to the practice of splicing up a game, releasing it in chunks and selling it in staggered fashion to increase profits. A lot of that has to do with my age and growing up in an era where that didn't happen. I was a child in the 80's, a teenager in the 90's and in my early 20's during the PS2 era. None of this shit happened. We got the entire game on disc or cartridge and if it was planned to be in the game, things like added difficulty or map tracking etc., it came along with your initial purchase.
But if you want to pay $90.00 or $100.00 for a video game, that's your money and your choice. I won't begrudge you. It's just not something I'm ok with.