+1!
To bring back the serious Civ player who has stuck with Civ IV BtS as the obvious choice over the Civ V, in Civ VI, Firaxis will need to abandon 1UPT, global happiness, a pathetic espionage system, revise its civics replacement tied to global cultural levels, drastically reduce the effect of natural wonder discovery, drastically reduce the effect or eliminate ruins, drastically reduce the effect of luck in the religion system, drastically change the diplomatic system so the player can understand how to improve relations when desired, abandon its per turn maintenance of buildings, drastically reduce or eliminate both city states and barbarians. Essentially, Firaxis needs to design a new Civ VI with the best ideas from Civ IV BtS, Civ V, plus many new ideas that are in balance and have immense replay value like Civ VI BtS despite its remaining flaws.
Sun Tzu Wu
Wow, you guys really hate CiV. You don't want CiVI. You want CIV with updated graphics. 1UPT keeps SODs from happening, which aren't fun. I play both CIV and CiV, and that's probably my biggest complaint with CIV, along with the tiny UI that makes it impossible to get where I want.
Global happiness is not broken, and realistic. It encourages planning, trading, and warfare. With per-city happiness, you can completely botch happiness in most of your cities, and keep growing your others. In CiV, it punishes you for expanding before your infrastructure can handle it, meaning that you have to plan out how you're going to manage your happiness before you settle a city, as opposed to 8 pop later.
I dislike BTS's espionage system, although I will admit that it is probably superior to CiV's.
I'm ambivalent about civics. On th one hand, you have the ability to turn your empire around on a dime, from a peaceful scientific people to a warmongering theocracy in a matter of turns, which makes you able to adapt to anything the extraordinarily predictable AI throws at you. On the other hand, it makes you lax in planning out what you should pick, because you could just change it later.
Natural wonders, I'm fine with, because historically, whoever had access to them did have an advantage. Fiddle around with the XML to disable them if you hate them that much.
Ruins are fine as they are. You don't like them, there is literally an option in Vanilla that disables them.
I, too, dislike the current randomness in the religion system, but 1. There are mods for that, which I always play with, and 2. It's better than the horrendous pile of garbage that is CIV religion.
Don't play CiV if you don't like the AI. CIV AI is "fun", which means that it plays to make the game fun for you. It's understandable, and is hilariously broken in being able to manipulate it into liking you. CiV AI is "challenging", which means that it plays to win; to challenge you. You don't understand the AI because it obfuscates its intentions, like a human player. Each AI has its only personality, and plays like a specific person. Some are more competitive, some are dicks (I'm looking at you, Alexander), and some aren't. You can't manipulate it like you can the CIV AI because it's trying to win just as hard as you are.
Per-turn maintenance of buildings makes it more important to have cash flow. It's still there in CIV, it's just hidden through city maintenance.
For this last bit, I have no idea how you got this. No city-states, I can get why you don't like those (after all, if it wasn't in CIV, it sucks), but
barbarians? Have you gone mad? Those are a vital element in restraining both you and the AI from going mad with workers and settlers, while generating an additional source of income. They were even in CIV! City-states are vital to the new systems, allowing you to develop faster. I find them to be a very useful place to direct the hundreds of gold I'm generating in the end-game.
In short, stop saying that everything CiV is bad. You want CIV, not CiV. Firaxis is not going to go back to 1UPT (there are multiple mods that change this, by the way), and global happiness is probably here to stay.