Not necessarily: the greater portion of talent there are still there because they lack the desire or ability to work at interesting startups, funded or not. Compensation and opportunity abundance both will have to significantly change that.
My experience hiring here right now is that we have more interesting, qualified candidates than we can possibly hire. If we were struggling to fill open positions with great talent I wouldn't be here. Compensation has gone up across the board to remain competitive, which is a good thing. This has changed dramatically in the last few years, especially as remote work has changed the hiring landscape.
It's a great time to be an engineer anywhere, including Madison.