I'm not going to get into the weeds of this, my intention was to state high-level objections to the underlying values behind such an approach.
I will say that, broadly, your ideas represent a fundamental change to what zoos are and can be, and in ways that go beyond aesthetics and revenue. It isn't the case that all zoo visitors can simply hop in a car and go to a major theme park (sorry, zoo) miles away down a freeway. Inner urban sites impose space restrictions, but they come with the compensating ability to reach and be reachable by the communities they serve. This is particularly important for zoos to be able to maintain equitable access for people of lower socio-economic status.
I think your intention is fine, but you are burning down the village in order to save it. And frankly, save it from what? It is time we move past this "how do we save zoos from themselves" argument. We've been having this discussion for 50 years, and while there is always room for a conversation about how zoos can continue to improve, the old collected wisdom - that zoos must move away from small cages, etc etc - is tired and out of date. Across the developed world, the vast majority of urban zoos have already achieved precisely that.
The solutions for species of welfare concern are known and, for the most part, implemented at zoos that have the space and resources. Zoos that don't have those resources are more often than not making the correct decision to phase out of species they cannot maintain well, leaving them to those they can.
And, coronavirus disruptions aside, the zoo sector as a whole is stunningly successful. More than a billion people visit zoos every year. Major urban zoos attract revenue in the tens of millions and are regularly able to invest in exhibit complexes of eye-watering cost, which rather suggests rumours of the death of zoos have been exaggerated. There is of course also a great many small zoos, many of them private businesses, that scratch a living too.
All of the above is before we come to the core point that people who enjoy theme parks - and resort hotels, for that matter - are already amply served by those industries. Why shouldn't those of us who enjoy zoos continue to enjoy a type of institution that has been successful now for 200 years?