Have you guys seen this Starbucks unicorn frappuccino? People seem to be freaking out about it due to the sugar content as if high sugar and carbs in our drinks is something new. Maybe it's because it's so colorful like cotton candy which people know has sugar? Meanwhile, people have been drinking regular Coke for years with no concern.
Personally, I never drink any liquid calories whether that liquid is made of pure crap without any nutritional value like these drinks or even if it's a healthier drink like a fruit smoothie. I much rather save my calories for food which fills me up. I rather eat fruit than drink fruit juice. I rather eat veggies than drink vegetable juice. If I'm going to drink soda, I'll drink diet soda not regular.
Cutting out liquid calories of all kinds, healthy or not, can make a huge difference. If you're used to drinking juice with each meal, by cutting that out and not making any other changes to your diet whatsoever, you'll probably drop a significant amount of weight. If you drink soda with every meal, switching to water or even diet soda will make a drastic difference. Ultimately, getting your calories from liquids is up to you but keep in mind that those calories will not be nearly as filling as solid food and you'll wind up having to consume more calories as a result.