I agree this would've been Walt's goal... his dream, but the reality would've been far different. Building a city like he wanted, employing the people to do these wonderful things in the name of research, etc. All that would've left him penniless. His wealth wasn't on the scale that would've been required. Estimates have his worth in the $100M-$150M range when he passed. Today that would be short of $1B, or possibly just more than. There's no way he could do this without a massive infusion of big money which would've dictated how and when he could spend that money. That said he'd have hated the whole venture due to not having carte blanche. His utopian city would've died on the vine unrealized, and his parks would likely have been sold off in the loss. Our entertainment world would be very different. He would've needed Musk-type money to even try what he wanted, and even then I think it'd have been tough to realize.
"Cancer cured today"... I'm sorry, but I have no words. I take your point, but scientists have been trying to cure cancer with government funds all over the world, and nearly 60 years later the best we've got is putting a poison in your veins in hopes of killing the cancer before the poison kills you. That, and microwaving you in hopes of shrinking the bad cells. Walt's dreams were massive and mostly wonderful. Realizing those dreams is a much different thing.
I also agree with
@Goofyernmost and his comments about a "do as I say type of community". That was absolutely Walt's plan... dictating how people would live in his city. That would've failed on a grand scale. That's CCP kinda stuff.
Who would voluntarily want to live in that atmosphere, and those who do aren't the greatest minds in the world to do things like cure cancer.