I was going to say “in all seriousness”, but the truth is I have some great ideas that people should let me slap together. No, I am not egotistical. BUT: in more spirit with the question, I will always end up pointing to independent developers with ambitious ideas here.
I think currently I would go for Brendon Chung. He seems to prefer to work solo, but I would love to see him get more resources. Skin Deep is probably my most anticipated game at this point.
Another big one that come to mind Bennett Foddy, mainly because I think he’s lowkey one of the most important game designers of our time. I’ll also second Tarn & Zach Adams. He’s not an indie, but most of the games Warren Spector works on always are too ambitious for their budget, and I’d love to see them get enough polish to be fully realized. There are also plenty of designers who I think have great narrative design, but don’t really have the resources to make larger games. (I’m thinking of folks like Aevee Bee)
Additionally, I’d love to see someone like Nathalie Lawhead or Jack King-Spooner get that blank check just because I have no idea what on earth they would make with all that budget.
Honestly, there have been so many incredible games that are just deeply compromised by their budget and resources. Since games have a higher functional bar than something like books or music, there are a lot of incredible ideas that just don’t have enough behind them to really shine. Grrr, capitalism!